{"title":"Astrophotography Filters","description":"Astrophotography filters for deep sky, planetary and narrowband imaging. Explore LRGB, SHO, dual narrowband and other filters for different imaging targets and setups.","products":[{"product_id":"lrgb-filters","title":"LRGB Filters","description":"\u003csection style=\"display: inline-block; width: 100%; vertical-align: top; align-self: flex-start; flex: 0 0 auto; height: auto; margin: 15px 0; box-sizing: border-box;\"\u003e\n\u003cdiv style=\"width: 100%; box-sizing: border-box; margin: 0 0 18px 0;\"\u003e\n\u003cdiv style=\"background-color: #26292e; padding: 10px 30px; border-left: 4px solid #3860ea; display: inline-block; border-radius: 8px 0 0 8px; box-sizing: border-box;\"\u003e\u003cspan style=\"font-size: 18px; color: #fff; font-weight: bold; letter-spacing: .5px;\"\u003eWhy Choose LRGB Filters?\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 22px; padding: 0 6px; font-size: 18px; line-height: 2; color: #23273b;\"\u003e\n\u003cspan style=\"font-weight: 600; color: #3860ea;\"\u003eDesigned to overcome light pollution,\u003c\/span\u003e the ToupTek Astro LRGB filter set empowers astrophotographers to reveal the universe's authentic chromatic splendor.\u003cbr\u003e\u003cbr\u003eThe RGB three-channel filters are essential tools for monochrome astronomy cameras to capture professional-grade images.\u003cbr\u003e\u003cbr\u003e\u003cspan style=\"color: #3860ea; font-weight: 600;\"\u003eToupTek Astro LRGB filters\u003c\/span\u003e utilize advanced optical materials and precise coating technology to selectively transmit celestial emissions while blocking urban light pollution. This brings the true colors of the starry sky vividly to life and significantly enhances image contrast.\u003cbr\u003e\u003cbr\u003eEven faint celestial targets can reveal rich details. The extremely low halo effect ensures each image has excellent fidelity, elevating your astrophotography to the next level.\u003c\/div\u003e\n\u003cdiv style=\"width: 100%; display: flex; flex-direction: column; justify-content: center; align-items: center; padding: 15px; box-sizing: border-box;\"\u003e\u003cimg alt=\"LRGB filters for astrophotography\" title=\"LRGB filters for astrophotography\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/Filters-LRGB-01.jpg?v=1751098204\" style=\"width: 80%; border-radius: 10px; box-shadow: 0 4px 8px rgba(0,0,0,.1);\"\u003e\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection style=\"display: inline-block; width: 100%; vertical-align: top; align-self: flex-start; flex: 0 0 auto; height: auto; margin: 15px 0; box-sizing: border-box;\"\u003e\n\u003cdiv style=\"width: 100%; box-sizing: border-box; margin: 0 0 18px 0;\"\u003e\n\u003cdiv style=\"background-color: #26292e; padding: 10px 30px; border-left: 4px solid #3860ea; display: inline-block; border-radius: 8px 0 0 8px; box-sizing: border-box;\"\u003e\u003cspan style=\"font-size: 18px; color: #fff; font-weight: bold; letter-spacing: .5px;\"\u003eTechnical Parameters\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 22px; padding: 0 2px; font-size: 18px; line-height: 2; color: #23273b;\"\u003e\n\u003cdiv style=\"margin-bottom: 10px;\"\u003e\n\u003cspan style=\"font-weight: 600; color: #3860ea;\"\u003eSize:\u003c\/span\u003e 36mm (unframed) \/ 1.25” (31.77mm) \/ 2”\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 10px;\"\u003e\n\u003cspan style=\"font-weight: 600; color: #3860ea;\"\u003eGlass Thickness:\u003c\/span\u003e 2mm\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 10px;\"\u003e\n\u003cspan style=\"font-weight: 600; color: #3860ea;\"\u003eTransmission Range:\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: #e04156; font-weight: 600;\"\u003eL\u003c\/span\u003e (420–690nm); \u003cspan style=\"color: #3860ea; font-weight: 600;\"\u003eR\u003c\/span\u003e (595–695nm); \u003cspan style=\"color: #27c18a; font-weight: 600;\"\u003eG\u003c\/span\u003e (495–580nm); \u003cspan style=\"color: #1cb5e0; font-weight: 600;\"\u003eB\u003c\/span\u003e (400–510nm)\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 10px;\"\u003e\n\u003cspan style=\"font-weight: 600; color: #3860ea;\"\u003eTransmittance:\u003c\/span\u003e \u0026gt;95%\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 10px;\"\u003e\n\u003cspan style=\"font-weight: 600; color: #3860ea;\"\u003eGlass Material:\u003c\/span\u003e Quartz glass\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 10px;\"\u003e\n\u003cspan style=\"font-weight: 600; color: #3860ea;\"\u003eFrame Material:\u003c\/span\u003e Aluminum Alloy\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 10px;\"\u003e\n\u003cspan style=\"font-weight: 600; color: #3860ea;\"\u003eSurface Treatment:\u003c\/span\u003e Double-sided high-precision optical polishing\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 10px;\"\u003e\n\u003cspan style=\"font-weight: 600; color: #3860ea;\"\u003eCoating Technology:\u003c\/span\u003e IAD (Ion Assisted Deposition) coating technology\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 10px;\"\u003e\n\u003cspan style=\"font-weight: 600; color: #3860ea;\"\u003eCoating System Design:\u003c\/span\u003e AR anti-reflection coating + quartz glass + precision cutoff coating layer\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan style=\"font-weight: 600; color: #3860ea;\"\u003eOD:\u003c\/span\u003e ≥5.0\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"width: 100%; display: flex; flex-direction: column; justify-content: center; align-items: center; padding: 15px; box-sizing: border-box;\"\u003e\u003cimg alt=\"LRGB filters for astrophotography\" title=\"LRGB filters for astrophotography\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/Filters-LRGB-02.jpg?v=1751098204\" style=\"width: 80%; border-radius: 10px; box-shadow: 0 4px 8px rgba(0,0,0,.1);\"\u003e\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection style=\"display: inline-block; width: 100%; vertical-align: top; align-self: flex-start; flex: 0 0 auto; height: auto; margin: 15px 0; box-sizing: border-box;\"\u003e\n\u003cdiv style=\"width: 100%; box-sizing: border-box; margin: 0 0 18px 0;\"\u003e\n\u003cdiv style=\"background-color: #26292e; padding: 10px 30px; border-left: 4px solid #3860ea; display: inline-block; border-radius: 8px 0 0 8px; box-sizing: border-box;\"\u003e\u003cspan style=\"font-size: 18px; color: #fff; font-weight: bold; letter-spacing: .5px;\"\u003eSpectrum\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"width: 100%; display: flex; flex-direction: column; justify-content: center; align-items: center; padding: 15px; box-sizing: border-box;\"\u003e\u003cimg alt=\"LRGB filters for astrophotography\" title=\"LRGB filters for astrophotography\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/Filters-LRGB-03.jpg?v=1751098204\" style=\"width: 80%; border-radius: 10px; box-shadow: 0 4px 8px rgba(0,0,0,.1);\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"font-size: 18px; line-height: 2; color: #23273b;\"\u003e\n\u003cdiv style=\"font-weight: 600; color: #3860ea; margin-bottom: 8px;\"\u003eSpectral Chart Reading Tips:\u003c\/div\u003e\n\u003cul style=\"margin: 0 0 12px 24px; padding: 0; list-style: disc;\"\u003e\n\u003cli\u003eThe horizontal axis represents the wavelength of light (\u003cb\u003eunit: nm\u003c\/b\u003e), and the vertical axis represents light transmittance (\u003cb\u003eunit: %\u003c\/b\u003e).\u003cbr\u003e\u003cspan style=\"color: #888;\"\u003eGray line: L channel; \u003cspan style=\"color: #e04156;\"\u003eRed: R\u003c\/span\u003e; \u003cspan style=\"color: #27c18a;\"\u003eGreen: G\u003c\/span\u003e; \u003cspan style=\"color: #1cb5e0;\"\u003eBlue: B\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003eThe emission nebula signal bands are mainly concentrated around \u003cb\u003e656nm (Hα)\u003c\/b\u003e, \u003cb\u003e500.7nm (OIII)\u003c\/b\u003e, and other bands.\u003c\/li\u003e\n\u003cli\u003eLight pollution peaks are commonly found near \u003cb\u003e540nm\u003c\/b\u003e and \u003cb\u003e590nm\u003c\/b\u003e (sodium\/mercury lamp bands).\u003c\/li\u003e\n\u003cli\u003eThe transmission regions of the astronomical filters are engineered to avoid these interference bands, ensuring effective signal passage, enhancing contrast, and image purity.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection style=\"display: inline-block; width: 100%; vertical-align: top; align-self: flex-start; flex: 0 0 auto; height: auto; margin: 15px 0; box-sizing: border-box;\"\u003e\n\u003cdiv style=\"width: 100%; box-sizing: border-box; margin: 0 0 18px 0;\"\u003e\n\u003cdiv style=\"background-color: #26292e; padding: 10px 30px; border-left: 4px solid #3860ea; display: inline-block; border-radius: 8px 0 0 8px; box-sizing: border-box;\"\u003e\u003cspan style=\"font-size: 18px; color: #fff; font-weight: bold; letter-spacing: .5px;\"\u003eKey Features\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"accordion\"\u003e\n\u003cdetails style=\"margin-bottom: 14px; border-radius: 10px; border: 1px solid #e6e8ee; overflow: hidden;\"\u003e\n\u003csummary style=\"background: linear-gradient(90deg,#3860ea,#1cb5e0); padding: 12px 18px; cursor: pointer; color: #fff; font-size: 18px; font-weight: bold; outline: 0;\"\u003e▶️ Accurate Wavelength Bands, Restoring True Colors\u003c\/summary\u003e\n\u003cdiv style=\"padding: 18px; font-size: 16.5px; line-height: 1.8; color: #23273b;\"\u003eHigh-precision wavelength positioning, RGB reproduction closer to the human eye for more realistic target colors.\u003cbr\u003e\u003cbr\u003e\u003cspan style=\"font-weight: 600; color: #3860ea;\"\u003e▲ L Filter (420–690nm):\u003c\/span\u003e UV\/IR cutoff for enhanced contrast and sharpness.\u003cbr\u003e\u003cspan style=\"font-weight: 600; color: #e04156;\"\u003e▲ R Filter (595–695nm):\u003c\/span\u003e Highlighting the Hα and SII bands.\u003cbr\u003e\u003cspan style=\"font-weight: 600; color: #27c18a;\"\u003e▲ G Filter (495–580nm):\u003c\/span\u003e Suppresses mercury\/sodium pollution while transmitting OIII.\u003cbr\u003e\u003cspan style=\"font-weight: 600; color: #1cb5e0;\"\u003e▲ B Filter (400–510nm):\u003c\/span\u003e Captures Hβ and OIII emissions.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 14px; border-radius: 10px; border: 1px solid #e6e8ee; overflow: hidden;\"\u003e\n\u003csummary style=\"background: linear-gradient(90deg,#3860ea,#1cb5e0); padding: 12px 18px; cursor: pointer; color: #fff; font-size: 18px; font-weight: bold; outline: 0;\"\u003e▶️ High-Quality Quartz Glass, High Transparency and Purity\u003c\/summary\u003e\n\u003cdiv style=\"padding: 18px; font-size: 16.5px; line-height: 1.8; color: #23273b;\"\u003eToupTek filters feature high-purity quartz glass substrates with \u0026gt;90% transmittance. They deliver exceptional blue-violet transmission and thermal stability, ideal for demanding astronomical imaging.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 14px; border-radius: 10px; border: 1px solid #e6e8ee; overflow: hidden;\"\u003e\n\u003csummary style=\"background: linear-gradient(90deg,#3860ea,#1cb5e0); padding: 12px 18px; cursor: pointer; color: #fff; font-size: 18px; font-weight: bold; outline: 0;\"\u003e▶️ IAD Dense Coating, Durable and Stable\u003c\/summary\u003e\n\u003cdiv style=\"padding: 18px; font-size: 16.5px; line-height: 1.8; color: #23273b;\"\u003eUsing IAD (Ion Assisted Deposition) coating technology, which is more costly than conventional vacuum evaporation but produces denser and more uniform coatings that are durable, corrosion-resistant, and have superior environmental stability.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 14px; border-radius: 10px; border: 1px solid #e6e8ee; overflow: hidden;\"\u003e\n\u003csummary style=\"background: linear-gradient(90deg,#3860ea,#1cb5e0); padding: 12px 18px; cursor: pointer; color: #fff; font-size: 18px; font-weight: bold; outline: 0;\"\u003e▶️ Precision Coating, Significantly Suppresses Halos\u003c\/summary\u003e\n\u003cdiv style=\"padding: 18px; font-size: 16.5px; line-height: 1.8; color: #23273b;\"\u003eToupTek filters use a proprietary multi-layer coating system—including single-sided cutoff, front AR coating, and edge blackening—to eliminate halos, minimize stray light, and ensure long-term durability.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 14px; border-radius: 10px; border: 1px solid #e6e8ee; overflow: hidden;\"\u003e\n\u003csummary style=\"background: linear-gradient(90deg,#3860ea,#1cb5e0); padding: 12px 18px; cursor: pointer; color: #fff; font-size: 18px; font-weight: bold; outline: 0;\"\u003e▶️ High Optical Cutoff Depth, Restores Natural Colors\u003c\/summary\u003e\n\u003cdiv style=\"padding: 18px; font-size: 16.5px; line-height: 1.8; color: #23273b;\"\u003eAll filters feature OD≥5.0 cutoff depth, blocking unwanted light to eliminate artifacts and deliver true-to-life color reproduction.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 14px; border-radius: 10px; border: 1px solid #e6e8ee; overflow: hidden;\"\u003e\n\u003csummary style=\"background: linear-gradient(90deg,#3860ea,#1cb5e0); padding: 12px 18px; cursor: pointer; color: #fff; font-size: 18px; font-weight: bold; outline: 0;\"\u003e▶️ Matte Black Edge Coating, Easy Installation\u003c\/summary\u003e\n\u003cdiv style=\"padding: 18px; font-size: 16.5px; line-height: 1.8; color: #23273b;\"\u003eAll filters feature matte black edge treatment to eliminate stray light, ensuring optimal transmittance and contrast.\u003cbr\u003e\u003cspan style=\"font-weight: 600; color: #3860ea;\"\u003e▲ 36mm filters:\u003c\/span\u003e Telescope-facing side has inward blackened border for instant orientation recognition.\u003cbr\u003e\u003cspan style=\"font-weight: 600; color: #1cb5e0;\"\u003e▲ 1.25\" \u0026amp; 2\" filters:\u003c\/span\u003e Feature threaded aluminum alloy frames for direct screw-in installation.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 14px; border-radius: 10px; border: 1px solid #e6e8ee; overflow: hidden;\"\u003e\n\u003csummary style=\"background: linear-gradient(90deg,#3860ea,#1cb5e0); padding: 12px 18px; cursor: pointer; color: #fff; font-size: 18px; font-weight: bold; outline: 0;\"\u003e▶️ Highly Compatible\u003c\/summary\u003e\n\u003cdiv style=\"padding: 18px; font-size: 16.5px; line-height: 1.8; color: #23273b;\"\u003eAll filters use a single-piece, glue-free structure.\u003cbr\u003e\u003cspan style=\"font-weight: 600; color: #3860ea;\"\u003e▲ 36mm:\u003c\/span\u003e APS-C \u0026amp; smaller sensors\u003cbr\u003e\u003cspan style=\"font-weight: 600; color: #1cb5e0;\"\u003e▲ 1.25\":\u003c\/span\u003e 1-inch \u0026amp; smaller sensors\u003cbr\u003e\u003cspan style=\"font-weight: 600; color: #ff5073;\"\u003e▲ 2\":\u003c\/span\u003e Full-frame \u0026amp; smaller sensors\u003cbr\u003eCompatible with industry-standard filter wheels:\u003cbr\u003e36mm: 7-hole \/ 1.25\": 8-hole \/ 2\": 5-hole\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"width: 100%; display: flex; flex-direction: column; justify-content: center; align-items: center; padding: 15px; box-sizing: border-box;\"\u003e\u003cimg alt=\"LRGB filters for astrophotography\" title=\"LRGB filters for astrophotography\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/Filters-LRGB-04.jpg?v=1751098204\" style=\"width: 80%; border-radius: 10px; box-shadow: 0 4px 8px rgba(0,0,0,.1);\"\u003e\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection style=\"display: inline-block; width: 100%; vertical-align: top; align-self: flex-start; flex: 0 0 auto; height: auto; margin: 15px 0; box-sizing: border-box;\"\u003e\n\u003cdiv style=\"width: 100%; box-sizing: border-box; margin: 0 0 18px 0;\"\u003e\n\u003cdiv style=\"background-color: #26292e; padding: 10px 30px; border-left: 4px solid #3860ea; display: inline-block; border-radius: 8px 0 0 8px; box-sizing: border-box;\"\u003e\u003cspan style=\"font-size: 18px; color: #fff; font-weight: bold; letter-spacing: .5px;\"\u003eToupTek Astro LRGB Filter Performance\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 22px; padding: 0 2px; font-size: 18px; line-height: 2; color: #23273b;\"\u003e\n\u003cdiv style=\"margin-bottom: 30px;\"\u003e\n\u003cb style=\"color: #3860ea;\"\u003eNGC1999\u003c\/b\u003e\u003cbr\u003ePhotographer: \u003cb\u003evoice\u003c\/b\u003e\u003cbr\u003eCamera: ToupTek ATR2600M\u003cbr\u003eGuide camera: GPM462M\u003cbr\u003eTelescope: Sky-Watcher F3.4\u003cbr\u003eMount: UMI\u003cbr\u003eFilters: ToupTek Astro 36mm LRGB\u0026amp;SHO\u003cbr\u003eIntegration: 12 each of RGB 600s, L 600s × 36, Hα 600s × 48\u003cbr\u003e\u003cspan style=\"font-weight: 600;\"\u003eTotal exposure: 20h\u003c\/span\u003e\n\u003cdiv style=\"margin-top: 14px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/Filters-LRGB-05.jpg?v=1751098204\" alt=\"NGC1999 Sample Image\" style=\"width: 100%; border-radius: 12px; box-shadow: 0 2px 8px rgba(30,50,100,.1); border: 1px solid #e6e8ee;\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 30px;\"\u003e\n\u003cb style=\"color: #3860ea;\"\u003eLBN777\u003c\/b\u003e\u003cbr\u003ePhotographer: \u003cb\u003evoice \u0026amp; LiiiiiCo\u003c\/b\u003e\u003cbr\u003eCamera: ToupTek ATR2600M\u003cbr\u003eGuide camera: GPM462M\u003cbr\u003eTelescope: Sky-Watcher F3.4\u003cbr\u003eFilters: ToupTek Astro 36mm LRGB\u0026amp;Hα\u003cbr\u003eMount: UMI\u003cbr\u003eIntegration: 20 each of RGB 600s, L 600s × 60, Hα 1200s × 40\u003cbr\u003e\u003cspan style=\"font-weight: 600;\"\u003eTotal exposure: 32h\u003c\/span\u003e\n\u003cdiv style=\"margin-top: 14px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/Filters-LRGB-06.jpg?v=1751098204\" alt=\"LBN777 Sample Image\" style=\"width: 100%; border-radius: 12px; box-shadow: 0 2px 8px rgba(30,50,100,.1); border: 1px solid #e6e8ee;\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 30px;\"\u003e\n\u003cb style=\"color: #3860ea;\"\u003eLDN 1532 \u0026amp; IC 2087\u003c\/b\u003e\u003cbr\u003ePhotographer: \u003cb\u003evoice\u003c\/b\u003e\u003cbr\u003eCamera: ToupTek ATR2600M\u003cbr\u003eGuide camera: GPM462M\u003cbr\u003eTelescope: Askar FRA400\u003cbr\u003eMount: UMI\u003cbr\u003eFilters: ToupTek Astro 36mm LRGB\u0026amp;SHO\u003cbr\u003eIntegration: 15 each of RGB 600s, L 600s × 45, Hα 600s × 66\u003cbr\u003e\u003cspan style=\"font-weight: 600;\"\u003eTotal exposure: 26h\u003c\/span\u003e\n\u003cdiv style=\"margin-top: 14px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/Filters-LRGB-07.jpg?v=1751098204\" alt=\"LDN 1532 \u0026amp; IC 2087 Sample Image\" style=\"width: 100%; border-radius: 12px; box-shadow: 0 2px 8px rgba(30,50,100,.1); border: 1px solid #e6e8ee;\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb style=\"color: #3860ea;\"\u003eM81 \u0026amp; M82\u003c\/b\u003e\u003cbr\u003e\n\u003cdiv style=\"margin-top: 14px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/Filters-LRGB-08.jpg?v=1751098204\" alt=\"M81 \u0026amp; M82 Sample Image\" style=\"width: 100%; border-radius: 12px; box-shadow: 0 2px 8px rgba(30,50,100,.1); border: 1px solid #e6e8ee;\"\u003e\u003c\/div\u003e\nPhotographer: \u003cb\u003eyahushua\u003c\/b\u003e\u003cbr\u003eTelescope: Askar 130HNT28-AL\u003cbr\u003eCamera: ToupTek Astro ATR585M\u003cbr\u003eMounts: iOptron CEM26\u003cbr\u003eGuide camera: G3M2210M\u003cbr\u003eFilters: ToupTek Astro 1.25” LRGB \u0026amp; H-alpha\u003cbr\u003e\u003cspan style=\"font-weight: 600;\"\u003eTotal exposure: 14h\u003c\/span\u003e\u003cbr\u003e\n\u003cdiv style=\"margin-top: 14px;\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/Filters-LRGB-09.jpg?v=1751098204\" alt=\"M81 \u0026amp; M82 Sample Image\" style=\"width: 100%; border-radius: 12px; box-shadow: 0 2px 8px rgba(30,50,100,.1); border: 1px solid #e6e8ee;\"\u003e\n\u003cp style=\"font-weight: bolder; padding-left: 50px; margin: 0;\"\u003eM81 L single exposure 300s\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-top: 14px;\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/Filters-LRGB-10.jpg?v=1751098204\" alt=\"M81 \u0026amp; M82 Sample Image\" style=\"width: 100%; border-radius: 12px; box-shadow: 0 2px 8px rgba(30,50,100,.1); border: 1px solid #e6e8ee;\"\u003e\n\u003cp style=\"font-weight: bolder; padding-left: 50px; margin: 0;\"\u003eM81 R single exposure 300s\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-top: 14px;\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/Filters-LRGB-11.jpg?v=1751098204\" alt=\"M81 \u0026amp; M82 Sample Image\" style=\"width: 100%; border-radius: 12px; box-shadow: 0 2px 8px rgba(30,50,100,.1); border: 1px solid #e6e8ee;\"\u003e\n\u003cp style=\"font-weight: bolder; padding-left: 50px; margin: 0;\"\u003eM81 G single exposure 300s\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-top: 14px;\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/Filters-LRGB-12.jpg?v=1751098204\" alt=\"M81 \u0026amp; M82 Sample Image\" style=\"width: 100%; border-radius: 12px; box-shadow: 0 2px 8px rgba(30,50,100,.1); border: 1px solid #e6e8ee;\"\u003e\n\u003cp style=\"font-weight: bolder; padding-left: 50px; margin: 0;\"\u003eM81 B single exposure 300s\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection style=\"display: inline-block; width: 100%; vertical-align: top; align-self: flex-start; flex: 0 0 auto; height: auto; margin: 15px 0; box-sizing: border-box;\"\u003e\n\u003cdiv style=\"width: 100%; box-sizing: border-box; margin: 0 0 18px 0;\"\u003e\n\u003cdiv style=\"background-color: #26292e; padding: 10px 30px; border-left: 4px solid #3860ea; display: inline-block; border-radius: 8px 0 0 8px; box-sizing: border-box;\"\u003e\u003cspan style=\"font-size: 18px; color: #fff; font-weight: bold; letter-spacing: .5px;\"\u003eInstallation\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 22px; padding: 0 2px; font-size: 18px; line-height: 2; color: #23273b;\"\u003e\n\u003cspan style=\"color: #3860ea; font-weight: 600;\"\u003e36mm Filters:\u003c\/span\u003e Align the inward black ring toward the telescope. Ensure instant orientation.\u003cbr\u003e\u003cspan style=\"color: #3860ea; font-weight: 600;\"\u003e1.25\" \u0026amp; 2\" Filters:\u003c\/span\u003e Screw directly into filter wheels—no front\/back orientation needed.\u003c\/div\u003e\n\u003cdiv style=\"width: 100%; display: flex; flex-direction: column; justify-content: center; align-items: center; padding: 15px; box-sizing: border-box;\"\u003e\u003cimg alt=\"HSO filters for astrophotography\" title=\"HSO filters for astrophotography\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/Filter36_Side.jpg?v=1751347642\" style=\"width: 80%; border-radius: 10px; box-shadow: 0 4px 8px rgba(0,0,0,.1);\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"width: 100%; display: flex; flex-direction: column; justify-content: center; align-items: center; padding: 15px; box-sizing: border-box;\"\u003e\u003cimg alt=\"HSO filters for astrophotography\" title=\"HSO filters for astrophotography\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/Filter36_Install.jpg?v=1751347630\" style=\"width: 80%; border-radius: 10px; box-shadow: 0 4px 8px rgba(0,0,0,.1);\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"width: 100%; display: flex; flex-direction: column; justify-content: center; align-items: center; padding: 15px; box-sizing: border-box;\"\u003e\u003cimg alt=\"LRGB filters for astrophotography\" title=\"LRGB filters for astrophotography\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/Filters-LRGB-13.jpg?v=1751098204\" style=\"width: 80%; border-radius: 10px; box-shadow: 0 4px 8px rgba(0,0,0,.1);\"\u003e\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection style=\"display: inline-block; width: 100%; vertical-align: top; align-self: flex-start; flex: 0 0 auto; height: auto; margin: 15px 0; box-sizing: border-box;\"\u003e\n\u003cdiv style=\"width: 100%; box-sizing: border-box; margin: 24px 0 18px 0;\"\u003e\n\u003cdiv style=\"background-color: #26292e; padding: 10px 30px; border-left: 4px solid #3860ea; display: inline-block; border-radius: 8px 0 0 8px; box-sizing: border-box;\"\u003e\u003cspan style=\"font-size: 18px; color: #fff; font-weight: bold; letter-spacing: .5px;\"\u003eWarranty and Service\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 22px; padding: 0 2px; font-size: 18px; line-height: 2; color: #23273b;\"\u003e\n\u003cul style=\"margin: 0 0 0 24px; padding: 0; list-style: disc;\"\u003e\n\u003cli style=\"margin-bottom: 10px;\"\u003e\n\u003cspan style=\"color: #3860ea; font-weight: 600;\"\u003eQuality Assurance Inspection:\u003c\/span\u003e Each filter undergoes pre-delivery spectral testing and rigorous screening to ensure consistent optical performance.\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 10px;\"\u003e\n\u003cspan style=\"color: #3860ea; font-weight: 600;\"\u003eAfter-sales Policy:\u003c\/span\u003e A two-year warranty covers manufacturing defects. ToupTek Astro offers professional technical support and usage guidance.\u003c\/li\u003e\n\u003cli\u003eFor assistance, contact our customer service or technical support through our support page:\u003cbr\u003e\u003ca href=\"https:\/\/touptek-astro.com\/supports\" style=\"color: #1cb5e0; text-decoration: underline;\" target=\"_blank\"\u003ehttps:\/\/touptek-astro.com\/supports\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection style=\"display: inline-block; width: 100%; vertical-align: top; align-self: flex-start; flex: 0 0 auto; height: auto; margin: 15px 0; box-sizing: border-box;\"\u003e\n\u003cdiv style=\"width: 100%; box-sizing: border-box; margin: 24px 0 18px 0;\"\u003e\n\u003cdiv style=\"background-color: #26292e; padding: 10px 30px; border-left: 4px solid #3860ea; display: inline-block; border-radius: 8px 0 0 8px; box-sizing: border-box;\"\u003e\u003cspan style=\"font-size: 18px; color: #fff; font-weight: bold; letter-spacing: .5px;\"\u003eImportant Notes\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 22px; padding: 0 2px; font-size: 18px; line-height: 2; color: #23273b;\"\u003e\n\u003cul style=\"margin: 0 0 0 24px; padding: 0; list-style: disc;\"\u003e\n\u003cli style=\"margin-bottom: 10px;\"\u003e\n\u003cspan style=\"color: #3860ea; font-weight: 600;\"\u003eColor Variation:\u003c\/span\u003e Filter coating colors may appear different under varying lighting conditions and viewing angles—this is normal optical behavior.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"color: #3860ea; font-weight: 600;\"\u003eProduct Improvements:\u003c\/span\u003e We continually optimize our products, which may result in minor specification and appearance updates. Specifications are subject to change without notice. Please refer to the physical product for final details.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e","brand":"ToupTek Astro","offers":[{"title":"LRGB 1.25\" Set","offer_id":50555778597176,"sku":"","price":116.0,"currency_code":"USD","in_stock":true},{"title":"LRGB 2\" Set","offer_id":50555778629944,"sku":"","price":215.0,"currency_code":"USD","in_stock":true},{"title":"LRGB 36mm Set","offer_id":50555778662712,"sku":"","price":161.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/LRGB_2_filter.jpg?v=1770945180"},{"product_id":"sho-filters","title":"SHO Narrowband Filters","description":"\u003csection style=\"display: inline-block; width: 100%; vertical-align: top; align-self: flex-start; flex: 0 0 auto; height: auto; margin: 15px 0; box-sizing: border-box;\"\u003e\n\u003cdiv style=\"width: 100%; box-sizing: border-box; margin: 0 0 18px 0;\"\u003e\n\u003cdiv style=\"background-color: #26292e; padding: 10px 30px; border-left: 4px solid #3860ea; display: inline-block; border-radius: 8px 0 0 8px; box-sizing: border-box;\"\u003e\u003cspan style=\"font-size: 18px; color: #fff; font-weight: bold; letter-spacing: .5px;\"\u003eWhy Choose Narrowband Filters?\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"padding: 22px 22px 16px 22px; font-size: 18px; line-height: 2; color: #23273b;\"\u003e\n\u003cspan style=\"font-weight: 600; color: #3860ea;\"\u003eNarrowband filters\u003c\/span\u003e are essential accessories in astrophotography used to isolate specific wavelength emission lines and enhance the signal-to-noise ratio of your target—especially for capturing breathtaking emission nebulae.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eToupTek SHO narrowband filters\u003c\/b\u003e are precisely tuned to the three main ionized emission lines found in star-forming regions:\n\u003cul style=\"margin: 8px 0 0 26px; padding: 0; list-style: disc; font-size: 18px;\"\u003e\n\u003cli\u003e\u003cspan style=\"color: #e04156; font-weight: 600;\"\u003eHα (656.3nm)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"color: #3860ea; font-weight: 600;\"\u003eSII (671.6nm)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"color: #1cb5e0; font-weight: 600;\"\u003eOIII (500.7nm)\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv style=\"margin-top: 12px;\"\u003eBy using these filters, you can effectively block urban light pollution and background stray light, dramatically enhance signal contrast, and bring out incredible detail—empowering you to achieve \u003cb\u003eHubble-like color mixing (SHO synthesis)\u003c\/b\u003e in your astrophotography.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"width: 100%; display: flex; flex-direction: column; justify-content: center; align-items: center; padding: 15px; box-sizing: border-box;\"\u003e\u003cimg alt=\"HSO filters for astrophotography\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/Filters-HSO-01.jpg?v=1751086834\" style=\"width: 80%; border-radius: 10px; box-shadow: 0 4px 8px rgba(0,0,0,.1);\" title=\"HSO filters for astrophotography\"\u003e\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection style=\"display: inline-block; width: 100%; vertical-align: top; align-self: flex-start; flex: 0 0 auto; height: auto; margin: 15px 0; box-sizing: border-box;\"\u003e\n\u003cdiv style=\"width: 100%; box-sizing: border-box; margin: 0 0 18px 0;\"\u003e\n\u003cdiv style=\"background-color: #26292e; padding: 10px 30px; border-left: 4px solid #3860ea; display: inline-block; border-radius: 8px 0 0 8px; box-sizing: border-box;\"\u003e\u003cspan style=\"font-size: 18px; color: #fff; font-weight: bold; letter-spacing: .5px;\"\u003eTechnical Parameters\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"padding: 22px 22px 16px 22px; font-size: 18px; line-height: 2; color: #23273b;\"\u003e\n\u003cdiv style=\"margin-bottom: 10px;\"\u003e\n\u003cspan style=\"font-weight: 600; color: #3860ea;\"\u003eSize:\u003c\/span\u003e 36mm (unframed) \/ 1.25” \/ 2”\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 10px;\"\u003e\n\u003cspan style=\"font-weight: 600; color: #3860ea;\"\u003eGlass Thickness:\u003c\/span\u003e 2mm\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 10px;\"\u003e\n\u003cspan style=\"font-weight: 600; color: #3860ea;\"\u003eTransmission Range:\u003c\/span\u003e\n\u003cul style=\"margin: 8px 0 0 26px; padding: 0; list-style: disc; font-size: 18px;\"\u003e\n\u003cli\u003e\n\u003cspan style=\"color: #e04156; font-weight: 600;\"\u003eH-alpha filter:\u003c\/span\u003e Central wavelength 656.3nm\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"color: #3860ea; font-weight: 600;\"\u003eSII filter:\u003c\/span\u003e Central wavelength 671.6nm\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"color: #1cb5e0; font-weight: 600;\"\u003eOIII filter:\u003c\/span\u003e Central wavelength 500.7nm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 10px;\"\u003e\n\u003cspan style=\"font-weight: 600; color: #3860ea;\"\u003eTransmittance:\u003c\/span\u003e \u0026gt;90%\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 10px;\"\u003e\n\u003cspan style=\"font-weight: 600; color: #3860ea;\"\u003eFWHM:\u003c\/span\u003e\n\u003cul style=\"margin: 8px 0 0 26px; padding: 0; list-style: disc; font-size: 18px;\"\u003e\n\u003cli\u003e\n\u003cb\u003e36mm:\u003c\/b\u003e H-alpha (4nm) \/ SII (4nm) \/ OIII (4nm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003e1.25” \u0026amp; 2”:\u003c\/b\u003e H-alpha (6.5nm) \/ SII (6.5nm) \/ OIII (6.5nm)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 10px;\"\u003e\n\u003cspan style=\"font-weight: 600; color: #3860ea;\"\u003eGlass Material:\u003c\/span\u003e Quartz glass\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 10px;\"\u003e\n\u003cspan style=\"font-weight: 600; color: #3860ea;\"\u003eFrame Material:\u003c\/span\u003e Aluminum Alloy\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 10px;\"\u003e\n\u003cspan style=\"font-weight: 600; color: #3860ea;\"\u003eSurface Treatment:\u003c\/span\u003e Double-sided high-precision optical polishing\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 10px;\"\u003e\n\u003cspan style=\"font-weight: 600; color: #3860ea;\"\u003eCoating Technology:\u003c\/span\u003e IAD (Ion Assisted Deposition)\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 10px;\"\u003e\n\u003cspan style=\"font-weight: 600; color: #3860ea;\"\u003eCoating System Design:\u003c\/span\u003e AR anti-reflection coating + quartz glass + precision cutoff coating layer\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan style=\"font-weight: 600; color: #3860ea;\"\u003eOD:\u003c\/span\u003e ≥5.0\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"width: 100%; display: flex; flex-direction: column; justify-content: center; align-items: center; padding: 15px; box-sizing: border-box;\"\u003e\u003cimg alt=\"HSO filters for astrophotography\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/Filters-HSO-02.jpg?v=1751086834\" style=\"width: 80%; border-radius: 10px; box-shadow: 0 4px 8px rgba(0,0,0,.1);\" title=\"HSO filters for astrophotography\"\u003e\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection style=\"display: inline-block; width: 100%; vertical-align: top; align-self: flex-start; flex: 0 0 auto; height: auto; margin: 15px 0; box-sizing: border-box;\"\u003e\n\u003cdiv style=\"width: 100%; box-sizing: border-box; margin: 0 0 18px 0;\"\u003e\n\u003cdiv style=\"background-color: #26292e; padding: 10px 30px; border-left: 4px solid #3860ea; display: inline-block; border-radius: 8px 0 0 8px; box-sizing: border-box;\"\u003e\u003cspan style=\"font-size: 18px; color: #fff; font-weight: bold; letter-spacing: .5px;\"\u003eKey Features\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"accordion\"\u003e\n\u003cdetails style=\"margin-bottom: 14px; border-radius: 10px; border: 1px solid #e6e8ee; overflow: hidden;\" open=\"\"\u003e\n\u003csummary style=\"background: linear-gradient(90deg,#3860ea,#1cb5e0); padding: 12px 18px; cursor: pointer; color: #fff; font-size: 18px; font-weight: bold; outline: 0;\"\u003e▶️ Precise Band Control \u0026amp; Enhanced Detail Resolution\u003c\/summary\u003e\n\u003cdiv style=\"padding: 18px; font-size: 16.5px; line-height: 1.8; color: #23273b;\"\u003eThe precise narrowband design effectively suppresses background noise while highlighting the emission structures of different elements, resulting in clearer celestial stratification and enhanced detail gradation.\u003cbr\u003e\u003cbr\u003e\u003cspan style=\"font-weight: 600; color: #e04156;\"\u003e▲ Hα filter:\u003c\/span\u003e Central wavelength 656.3nm, FWHM 4nm.\u003cbr\u003eOptimized for hydrogen ionization regions, this filter serves as the primary channel for capturing nebular morphology.\u003cbr\u003e\u003cspan style=\"font-weight: 600; color: #1cb5e0;\"\u003e▲ OIII filter:\u003c\/span\u003e Central wavelength 500.7nm (OIII emission line), FWHM 4nm.\u003cbr\u003eDesigned to reveal high-energy excitation zones, particularly effective for visualizing blue-green nebular details.\u003cbr\u003e\u003cspan style=\"font-weight: 600; color: #ff5073;\"\u003e▲ SII filter:\u003c\/span\u003e Central wavelength 671.6nm, FWHM 4nm.\u003cbr\u003eEnhances detection of faint signals and reveals structural stratification through ionized sulfur distribution. When combined with Hα, significantly improves image contrast.\u003cbr\u003e\u003cspan style=\"color: #888; font-size: 14px;\"\u003e*FWHM for 1.25-inch and 2-inch filters is 6.5nm.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 14px; border-radius: 10px; border: 1px solid #e6e8ee; overflow: hidden;\" open=\"\"\u003e\n\u003csummary style=\"background: linear-gradient(90deg,#3860ea,#1cb5e0); padding: 12px 18px; cursor: pointer; color: #fff; font-size: 18px; font-weight: bold; outline: 0;\"\u003e▶️ High-Quality Quartz Glass, High Transparency and Purity\u003c\/summary\u003e\n\u003cdiv style=\"padding: 18px; font-size: 16.5px; line-height: 1.8; color: #23273b;\"\u003eThe entire series of ToupTek Astro filters utilize high-quality colorless transparent quartz glass, with \u0026gt;90% high transmittance, high purity, exceptional blue-violet band transmission, and outstanding thermal stability—ideal for various demanding astronomical imaging applications.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 14px; border-radius: 10px; border: 1px solid #e6e8ee; overflow: hidden;\" open=\"\"\u003e\n\u003csummary style=\"background: linear-gradient(90deg,#3860ea,#1cb5e0); padding: 12px 18px; cursor: pointer; color: #fff; font-size: 18px; font-weight: bold; outline: 0;\"\u003e▶️ IAD Dense Coating, Durable and Stable\u003c\/summary\u003e\n\u003cdiv style=\"padding: 18px; font-size: 16.5px; line-height: 1.8; color: #23273b;\"\u003eUsing IAD (Ion Assisted Deposition) coating technology, which is more costly than conventional vacuum evaporation but produces denser and more uniform coatings that are durable, corrosion-resistant, and have superior environmental stability.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 14px; border-radius: 10px; border: 1px solid #e6e8ee; overflow: hidden;\" open=\"\"\u003e\n\u003csummary style=\"background: linear-gradient(90deg,#3860ea,#1cb5e0); padding: 12px 18px; cursor: pointer; color: #fff; font-size: 18px; font-weight: bold; outline: 0;\"\u003e▶️ Precision Coating, Significantly Suppresses Halos\u003c\/summary\u003e\n\u003cdiv style=\"padding: 18px; font-size: 16.5px; line-height: 1.8; color: #23273b;\"\u003eToupTek Astro filters employ a proprietary multi-layer system: a single-sided cutoff coating, front surface AR anti-reflection coating, and edge blackening treatment. This combination effectively minimizes internal reflections and stray light while ensuring coating integrity and extended service life.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 14px; border-radius: 10px; border: 1px solid #e6e8ee; overflow: hidden;\" open=\"\"\u003e\n\u003csummary style=\"background: linear-gradient(90deg,#3860ea,#1cb5e0); padding: 12px 18px; cursor: pointer; color: #fff; font-size: 18px; font-weight: bold; outline: 0;\"\u003e▶️ High Optical Cutoff Depth, Restores Natural Colors\u003c\/summary\u003e\n\u003cdiv style=\"padding: 18px; font-size: 16.5px; line-height: 1.8; color: #23273b;\"\u003eAll channel filters have a cutoff depth of OD≥5.0, effectively blocking non-target spectral regions, avoiding band crosstalk and color cast, resulting in accurate and natural color reproduction.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 14px; border-radius: 10px; border: 1px solid #e6e8ee; overflow: hidden;\" open=\"\"\u003e\n\u003csummary style=\"background: linear-gradient(90deg,#3860ea,#1cb5e0); padding: 12px 18px; cursor: pointer; color: #fff; font-size: 18px; font-weight: bold; outline: 0;\"\u003e▶️ Matte Black Edge Coating, Easy Installation\u003c\/summary\u003e\n\u003cdiv style=\"padding: 18px; font-size: 16.5px; line-height: 1.8; color: #23273b;\"\u003eThe filter edge is coated with a black matte treatment to minimize stray light, which ensures transmittance, reduces glare, and enhances image contrast.\u003cbr\u003e\u003cspan style=\"font-weight: 600; color: #3860ea;\"\u003e▲ 36mm filters:\u003c\/span\u003e The telescope-facing side has an inward-extending blackened border for quick orientation identification.\u003cbr\u003e\u003cspan style=\"font-weight: 600; color: #1cb5e0;\"\u003e▲ 1.25\" \u0026amp; 2\" filters:\u003c\/span\u003e Feature threaded aluminum alloy frames for direct screw-in installation, ensuring fast and tool-free mounting.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 14px; border-radius: 10px; border: 1px solid #e6e8ee; overflow: hidden;\" open=\"\"\u003e\n\u003csummary style=\"background: linear-gradient(90deg,#3860ea,#1cb5e0); padding: 12px 18px; cursor: pointer; color: #fff; font-size: 18px; font-weight: bold; outline: 0;\"\u003e▶️ Highly Compatible\u003c\/summary\u003e\n\u003cdiv style=\"padding: 18px; font-size: 16.5px; line-height: 1.8; color: #23273b;\"\u003eAll filters use a single-piece, glue-free structure.\u003cbr\u003e\u003cspan style=\"font-weight: 600; color: #3860ea;\"\u003e▲ 36mm:\u003c\/span\u003e Recommended for APS-C and smaller cameras.\u003cbr\u003e\u003cspan style=\"font-weight: 600; color: #1cb5e0;\"\u003e▲ 1.25\":\u003c\/span\u003e Recommended for cameras with a 1-inch or smaller sensor.\u003cbr\u003e\u003cspan style=\"font-weight: 600; color: #ff5073;\"\u003e▲ 2\":\u003c\/span\u003e Recommended for full-frame and smaller cameras.\u003cbr\u003eCompatible with various brands on the market featuring 7-hole 36mm, 8-hole 1.25-inch, and 5-hole 2-inch electric filter wheels, offering a wider range of compatibility options.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"width: 100%; display: flex; flex-direction: column; justify-content: center; align-items: center; padding: 15px; box-sizing: border-box;\"\u003e\u003cimg alt=\"HSO filters for astrophotography\" title=\"HSO filters for astrophotography\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/Filters-HSO-03.jpg?v=1751086834\" style=\"width: 80%; border-radius: 10px; box-shadow: 0 4px 8px rgba(0,0,0,.1);\"\u003e\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection style=\"display: inline-block; width: 100%; vertical-align: top; align-self: flex-start; flex: 0 0 auto; height: auto; margin: 15px 0; box-sizing: border-box;\"\u003e\n\u003cdiv style=\"width: 100%; box-sizing: border-box; margin: 0 0 18px 0;\"\u003e\n\u003cdiv style=\"background-color: #26292e; padding: 10px 30px; border-left: 4px solid #3860ea; display: inline-block; border-radius: 8px 0 0 8px; box-sizing: border-box;\"\u003e\u003cspan style=\"font-size: 18px; color: #fff; font-weight: bold; letter-spacing: .5px;\"\u003eSpectrum\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; gap: 16px; align-items: center; justify-content: center;\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/HSO-Spectrogram-01.jpg?v=1751090460\" alt=\"3.5 and 4nm HSO filter spectrum\" style=\"max-width: 45%; border-radius: 12px; border: 1px solid #e6e8ee; box-shadow: 0 1px 8px rgba(30,50,100,.07); background: #fff;\"\u003e \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/HSO-Spectrogram-02.jpg?v=1751090460\" alt=\"6.5nm HSO filter spectrum\" style=\"max-width: 45%; border-radius: 12px; border: 1px solid #e6e8ee; box-shadow: 0 1px 8px rgba(30,50,100,.07); background: #fff;\"\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-top: 20px; font-size: 18px; line-height: 1.9;\"\u003e\n\u003cdiv style=\"margin-bottom: 8px;\"\u003e\u003cspan style=\"font-weight: 600; color: #3860ea;\"\u003eSpectral Chart Reading Tips:\u003c\/span\u003e\u003c\/div\u003e\n\u003cul style=\"margin: 0 0 12px 16px; padding: 0; list-style: disc;\"\u003e\n\u003cli\u003e\n\u003cb\u003eThe horizontal axis\u003c\/b\u003e represents the wavelength of light (in nm), and \u003cb\u003ethe vertical axis\u003c\/b\u003e represents light transmittance (percentage %).\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"color: #e04156; font-weight: 600;\"\u003eRed line\u003c\/span\u003e: Hα (656nm); \u003cspan style=\"color: #27c18a; font-weight: 600;\"\u003eGreen line\u003c\/span\u003e: OIII (500.7nm); \u003cspan style=\"color: #3860ea; font-weight: 600;\"\u003eBlue line\u003c\/span\u003e: SII (672.4nm).\u003c\/li\u003e\n\u003cli\u003eEmission nebula signal bands are mainly at \u003cb\u003e656nm (Hα)\u003c\/b\u003e, \u003cb\u003e500.7nm (OIII)\u003c\/b\u003e, and similar wavelengths.\u003c\/li\u003e\n\u003cli\u003eLight pollution peaks are often found near \u003cb\u003e540nm\u003c\/b\u003e and \u003cb\u003e590nm\u003c\/b\u003e (sodium\/mercury lamp bands).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003eThe transmission regions of our astronomical filters are engineered to avoid these interference bands, ensuring maximum signal clarity, enhanced contrast, and high image purity for deep-sky imaging.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection style=\"display: inline-block; width: 100%; vertical-align: top; align-self: flex-start; flex: 0 0 auto; height: auto; margin: 15px 0; box-sizing: border-box;\"\u003e\n\u003cdiv style=\"width: 100%; box-sizing: border-box; margin: 0 0 18px 0;\"\u003e\n\u003cdiv style=\"background-color: #26292e; padding: 10px 30px; border-left: 4px solid #3860ea; display: inline-block; border-radius: 8px 0 0 8px; box-sizing: border-box;\"\u003e\u003cspan style=\"font-size: 18px; color: #fff; font-weight: bold; letter-spacing: .5px;\"\u003eToupTek Astro HSO Narrowband Filter Performance\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"padding: 22px 22px 16px 22px; font-size: 18px; line-height: 2; color: #23273b;\"\u003e\n\u003cdiv style=\"margin-bottom: 30px;\"\u003e\n\u003cb style=\"color: #3860ea;\"\u003eIC5070\u003c\/b\u003e\u003cbr\u003ePhotographer: \u003cb\u003evoice\u003c\/b\u003e\u003cbr\u003eTelescope: Sky-Watcher\u003cbr\u003eMount: UMI\u003cbr\u003eCamera: ToupTek Astro ATR2600M\u003cbr\u003eFilters: ToupTek Astro 36mm LRGB\u0026amp;SHO\u003cbr\u003eIntegration: Hα: 30 × 600s ; SII: 30 × 600s ; OIII: 30 × 600s\u003cbr\u003e\u003cspan style=\"font-weight: 600;\"\u003eTotal exposure: 15h\u003c\/span\u003e\n\u003cdiv style=\"margin-top: 14px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/Filters-HSO-05.jpg?v=1751086834\" alt=\"IC5070 Sample Image\" style=\"width: 100%; border-radius: 12px; box-shadow: 0 2px 8px rgba(30,50,100,.1); border: 1px solid #e6e8ee;\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 30px;\"\u003e\n\u003cb style=\"color: #3860ea;\"\u003eIC443\u003c\/b\u003e\u003cbr\u003ePhotographer: \u003cb\u003evoice\u003c\/b\u003e\u003cbr\u003eTelescope: Sky-Watcher F3.4\u003cbr\u003eCamera: ToupTek Astro ATR2600M \/ ATR2600C\u003cbr\u003eMount: UMI\u003cbr\u003eFilters: ToupTek Astro 36mm HSO\u003cbr\u003eProcessing: Narrowband combination using HSO channel mapping\u003cbr\u003e\u003cspan style=\"font-weight: 600;\"\u003eTotal exposure: 20h\u003c\/span\u003e\n\u003cdiv style=\"margin-top: 14px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/Filters-HSO-06.jpg?v=1751086834\" alt=\"IC443 Sample Image\" style=\"width: 100%; border-radius: 12px; box-shadow: 0 2px 8px rgba(30,50,100,.1); border: 1px solid #e6e8ee;\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 30px;\"\u003e\n\u003cb style=\"color: #3860ea;\"\u003eNGC2237\u003c\/b\u003e\u003cbr\u003ePhotographer: \u003cb\u003e原上行川\u003c\/b\u003e\u003cbr\u003eTelescope: Askar SQA55\u003cbr\u003eCamera: ToupTek Astro ATR2600M\u003cbr\u003eMount: iOptron HAE16C\u003cbr\u003eFilters: ToupTek Astro 36mm HSO\u003cbr\u003eAstrophotography wireless controller: StellaVita\u003cbr\u003eIntegration: Hα: 71 ; OIII: 63 ; SII: 49\u003cbr\u003e\u003cspan style=\"font-weight: 600;\"\u003eTotal exposure: 15h\u003c\/span\u003e\n\u003cdiv style=\"margin-top: 14px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/Filters-HSO-07.jpg?v=1751086834\" alt=\"NGC2237 Sample Image\" style=\"width: 100%; border-radius: 12px; box-shadow: 0 2px 8px rgba(30,50,100,.1); border: 1px solid #e6e8ee;\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb style=\"color: #3860ea;\"\u003eM16\u003c\/b\u003e\u003cbr\u003ePhotographer: \u003cb\u003eYahushua\u003c\/b\u003e\u003cbr\u003eTelescope: Askar 130HNT28-AL\u003cbr\u003eCamera: ToupTek Astro ATR585M\u003cbr\u003eMount: iOptron CEM26\u003cbr\u003eGuide camera: G3M2210M\u003cbr\u003eFilters: ToupTek Astro 1.25” HSO\u003cbr\u003e\u003cspan style=\"font-weight: 600;\"\u003eTotal exposure: 7h\u003c\/span\u003e\n\u003cdiv style=\"margin-top: 14px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/Filters-HSO-08.jpg?v=1751086834\" alt=\"NGC2237 Sample Image\" style=\"width: 100%; border-radius: 12px; box-shadow: 0 2px 8px rgba(30,50,100,.1); border: 1px solid #e6e8ee;\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"margin-top: 14px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/Filters-HSO-09.jpg?v=1751086834\" alt=\"M16 Sample Image\" style=\"width: 100%; border-radius: 12px; box-shadow: 0 2px 8px rgba(30,50,100,.1); border: 1px solid #e6e8ee;\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 30px;\"\u003e\n\u003cb style=\"color: #3860ea;\"\u003eNGC6357\u003c\/b\u003e\u003cbr\u003ePhotographer: \u003cb\u003evoice\u003c\/b\u003e\u003cbr\u003eTelescope: Sky-Watcher\u003cbr\u003eCamera: ASI2600M\u003cbr\u003eFilters: ToupTek Astro 2” HSO\u003cbr\u003eMount: UMi 17\u003cbr\u003eIntegration: Hα: 36 × 600s ; SII: 36 × 600s ; OIII: 36 × 600s\u003cbr\u003e\u003cspan style=\"font-weight: 600;\"\u003eTotal exposure: 18h\u003c\/span\u003e\n\u003cdiv style=\"margin-top: 14px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/Filters-HSO-10.jpg?v=1751086834\" alt=\"NGC6357 Sample Image\" style=\"width: 100%; border-radius: 12px; box-shadow: 0 2px 8px rgba(30,50,100,.1); border: 1px solid #e6e8ee;\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection style=\"display: inline-block; width: 100%; vertical-align: top; align-self: flex-start; flex: 0 0 auto; height: auto; margin: 15px 0; box-sizing: border-box;\"\u003e\n\u003cdiv style=\"width: 100%; box-sizing: border-box; margin: 0 0 18px 0;\"\u003e\n\u003cdiv style=\"background-color: #26292e; padding: 10px 30px; border-left: 4px solid #3860ea; display: inline-block; border-radius: 8px 0 0 8px; box-sizing: border-box;\"\u003e\u003cspan style=\"font-size: 18px; color: #fff; font-weight: bold; letter-spacing: .5px;\"\u003eInstallation\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"padding: 22px 22px 16px 22px; font-size: 18px; line-height: 2; color: #23273b;\"\u003e\n\u003cul style=\"margin: 0 0 0 24px; padding: 0; list-style: disc;\"\u003e\n\u003cli style=\"margin-bottom: 10px;\"\u003e\n\u003cb style=\"color: #3860ea;\"\u003e36mm unframed filters:\u003c\/b\u003e Special coating eliminates ghosting. To install, align the side with the inward-extending black ring toward the telescope for instant orientation and improved convenience.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb style=\"color: #3860ea;\"\u003e1.25\" \u0026amp; 2\" filters:\u003c\/b\u003e Special coating removes front\/back orientation concerns—simply screw in for fast, tool-free installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"width: 100%; display: flex; flex-direction: column; justify-content: center; align-items: center; padding: 15px; box-sizing: border-box;\"\u003e\u003cimg alt=\"HSO filters for astrophotography\" title=\"HSO filters for astrophotography\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/Filter36_Side.jpg?v=1751347642\" style=\"width: 80%; border-radius: 10px; box-shadow: 0 4px 8px rgba(0,0,0,.1);\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"width: 100%; display: flex; flex-direction: column; justify-content: center; align-items: center; padding: 15px; box-sizing: border-box;\"\u003e\u003cimg alt=\"HSO filters for astrophotography\" title=\"HSO filters for astrophotography\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/Filter36_Install.jpg?v=1751347630\" style=\"width: 80%; border-radius: 10px; box-shadow: 0 4px 8px rgba(0,0,0,.1);\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"width: 100%; display: flex; flex-direction: column; justify-content: center; align-items: center; padding: 15px; box-sizing: border-box;\"\u003e\u003cimg alt=\"HSO filters for astrophotography\" title=\"HSO filters for astrophotography\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/Filters-HSO-11.jpg?v=1751086834\" style=\"width: 80%; border-radius: 10px; box-shadow: 0 4px 8px rgba(0,0,0,.1);\"\u003e\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection style=\"display: inline-block; width: 100%; vertical-align: top; align-self: flex-start; flex: 0 0 auto; height: auto; margin: 15px 0; box-sizing: border-box;\"\u003e\n\u003cdiv style=\"width: 100%; box-sizing: border-box; margin: 0 0 18px 0;\"\u003e\n\u003cdiv style=\"background-color: #26292e; padding: 10px 30px; border-left: 4px solid #3860ea; display: inline-block; border-radius: 8px 0 0 8px; box-sizing: border-box;\"\u003e\u003cspan style=\"font-size: 18px; color: #fff; font-weight: bold; letter-spacing: .5px;\"\u003eWarranty and Service\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"padding: 22px 22px 16px 22px; font-size: 18px; line-height: 2; color: #23273b;\"\u003e\n\u003cul style=\"margin: 0 0 0 24px; padding: 0; list-style: disc;\"\u003e\n\u003cli style=\"margin-bottom: 10px;\"\u003e\n\u003cb style=\"color: #3860ea;\"\u003eQuality Assurance Inspection:\u003c\/b\u003e Each filter undergoes pre-delivery spectral testing and rigorous screening to guarantee consistent optical performance.\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 10px;\"\u003e\n\u003cb style=\"color: #3860ea;\"\u003eAfter-sales Policy:\u003c\/b\u003e Includes a two-year warranty covering manufacturing defects, plus professional technical support and usage guidance.\u003c\/li\u003e\n\u003cli\u003eFor assistance, please contact our support team:\u003cbr\u003e\u003ca href=\"https:\/\/touptek-astro.com\/supports\" style=\"color: #1cb5e0; text-decoration: underline;\" target=\"_blank\"\u003ehttps:\/\/touptek-astro.com\/supports\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection style=\"display: inline-block; width: 100%; vertical-align: top; align-self: flex-start; flex: 0 0 auto; height: auto; margin: 15px 0; box-sizing: border-box;\"\u003e\n\u003cdiv style=\"width: 100%; box-sizing: border-box; margin: 0 0 18px 0;\"\u003e\n\u003cdiv style=\"background-color: #26292e; padding: 10px 30px; border-left: 4px solid #3860ea; display: inline-block; border-radius: 8px 0 0 8px; box-sizing: border-box;\"\u003e\u003cspan style=\"font-size: 18px; color: #fff; font-weight: bold; letter-spacing: .5px;\"\u003eImportant Notes\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"padding: 22px 22px 16px 22px; font-size: 18px; line-height: 2; color: #23273b;\"\u003e\n\u003cul style=\"margin: 0 0 0 24px; padding: 0; list-style: disc;\"\u003e\n\u003cli style=\"margin-bottom: 10px;\"\u003e\n\u003cb style=\"color: #3860ea;\"\u003eColor Variation:\u003c\/b\u003e Filter coating colors may appear different under varying lighting conditions and viewing angles—this is normal optical behavior.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb style=\"color: #3860ea;\"\u003eProduct Improvements:\u003c\/b\u003e We continually optimize our products, which may result in minor specification and appearance updates. Specifications are subject to change without notice. Please refer to the physical product for final details.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e","brand":"ToupTek Astro","offers":[{"title":"SHO 36mm Narrowband Filters-4nm \/ Hα Filter","offer_id":50556219982136,"sku":null,"price":165.0,"currency_code":"USD","in_stock":true},{"title":"SHO 36mm Narrowband Filters-4nm \/ SII Filter","offer_id":50556267397432,"sku":null,"price":165.0,"currency_code":"USD","in_stock":true},{"title":"SHO 36mm Narrowband Filters-4nm \/ OIII Filter","offer_id":50556267430200,"sku":null,"price":165.0,"currency_code":"USD","in_stock":true},{"title":"SHO 36mm Narrowband Filters-4nm \/ SHO Filters Set","offer_id":50556267462968,"sku":null,"price":431.0,"currency_code":"USD","in_stock":true},{"title":"SHO 1.25\" Narrowband Filters-6.5nm \/ Hα Filter","offer_id":49224244298040,"sku":"","price":165.0,"currency_code":"USD","in_stock":false},{"title":"SHO 1.25\" Narrowband Filters-6.5nm \/ SII Filter","offer_id":50556267200824,"sku":null,"price":165.0,"currency_code":"USD","in_stock":false},{"title":"SHO 1.25\" Narrowband Filters-6.5nm \/ OIII Filter","offer_id":50556267233592,"sku":null,"price":165.0,"currency_code":"USD","in_stock":false},{"title":"SHO 1.25\" Narrowband Filters-6.5nm \/ SHO Filters Set","offer_id":50556267266360,"sku":null,"price":260.0,"currency_code":"USD","in_stock":true},{"title":"SHO 2\" Narrowband Filters-6.5nm \/ Hα Filter","offer_id":50556219457848,"sku":null,"price":165.0,"currency_code":"USD","in_stock":true},{"title":"SHO 2\" Narrowband Filters-6.5nm \/ SII Filter","offer_id":50556267299128,"sku":null,"price":165.0,"currency_code":"USD","in_stock":true},{"title":"SHO 2\" Narrowband Filters-6.5nm \/ OIII Filter","offer_id":50556267331896,"sku":null,"price":165.0,"currency_code":"USD","in_stock":true},{"title":"SHO 2\" Narrowband Filters-6.5nm \/ SHO Filters Set","offer_id":50556267364664,"sku":null,"price":458.0,"currency_code":"USD","in_stock":true},{"title":"SHO 2\"Narrowband Filters-4nm \/ Hα Filter","offer_id":51751403847992,"sku":null,"price":192.0,"currency_code":"USD","in_stock":true},{"title":"SHO 2\"Narrowband Filters-4nm \/ SII Filter","offer_id":51751403880760,"sku":null,"price":192.0,"currency_code":"USD","in_stock":true},{"title":"SHO 2\"Narrowband Filters-4nm \/ OIII Filter","offer_id":51751403913528,"sku":null,"price":192.0,"currency_code":"USD","in_stock":true},{"title":"SHO 2\"Narrowband Filters-4nm \/ SHO Filters Set","offer_id":51751403946296,"sku":null,"price":539.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/SHO_36mm_filter.jpg?v=1773197034"},{"product_id":"sho-filters-4nm-2inch","title":"SHO Filters 4nm 2inch","description":"\u003cdiv style=\"background: linear-gradient(135deg,#0f0f1e 0,#1a1a3e 100%); padding: 40px 20px; text-align: center;\"\u003e\n\u003ch1 style=\"color: #fff; font-size: clamp(24px,5vw,36px); margin: 0 0 10px 0; font-weight: bold; letter-spacing: 1px;\"\u003eSHO-2-inch-4nm\u003c\/h1\u003e\n\u003cp style=\"color: #00d4ff; font-size: clamp(14px,3vw,18px); margin: 0; text-transform: uppercase; letter-spacing: 2px;\"\u003ePrecision Narrowband Filter\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"max-width: 1200px; margin: 0 auto; padding: 20px;\"\u003e\n\u003cdiv style=\"background: #f8f9fa; border-radius: 12px; padding: 30px 20px; margin-bottom: 30px; box-shadow: 0 2px 10px rgba(0,0,0,.05);\"\u003e\n\u003ch2 style=\"color: #1a1a3e; font-size: clamp(20px,4vw,28px); margin: 0 0 20px 0; border-left: 4px solid #00d4ff; padding-left: 15px;\"\u003eToupTek Astro SHO Narrowband Filter Introduction\u003c\/h2\u003e\n\u003cp style=\"color: #4a4a4a; font-size: clamp(14px,2.5vw,16px); line-height: 1.8; margin: 0;\"\u003eNarrowband filters are essential for astrophotography. The ToupTek Astronomy SHO filter targets the three key ionized emission lines in stellar nurseries: Hα, SII, and OIII. With a narrower 4nm FWHM bandpass, it precisely transmits the target light while providing stronger suppression of urban light pollution and background gradients. This also reduces band overlap, resulting in higher signal-to-noise ratio, improved contrast, and more distinct detail. It is well-suited for creating images in the Hubble Palette.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"text-align: center; margin-bottom: 40px;\"\u003e\u003cimg style=\"max-width: 100%; height: auto; border-radius: 8px; box-shadow: 0 4px 20px rgba(0,0,0,.1);\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/4nm_SHO_detail_01.jpg\" alt=\"SHO Filter Product\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"background: #fff; border: 1px solid #e0e0e0; border-radius: 12px; padding: 30px 20px; margin-bottom: 30px;\"\u003e\n\u003ch2 style=\"color: #1a1a3e; font-size: clamp(20px,4vw,28px); margin: 0 0 25px 0; text-align: center;\"\u003eTechnical Parameters\u003c\/h2\u003e\n\u003cdiv style=\"display: grid; grid-template-columns: repeat(auto-fit,minmax(250px,1fr)); gap: 20px;\"\u003e\n\u003cdiv style=\"padding: 15px; background: linear-gradient(135deg,#f5f7fa 0,#fff 100%); border-radius: 8px; border-left: 3px solid #00d4ff;\"\u003e\n\u003cstrong style=\"color: #1a1a3e; display: block; margin-bottom: 5px;\"\u003eSize\u003c\/strong\u003e \u003cspan style=\"color: #4a4a4a;\"\u003e2\"\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"padding: 15px; background: linear-gradient(135deg,#f5f7fa 0,#fff 100%); border-radius: 8px; border-left: 3px solid #00d4ff;\"\u003e\n\u003cstrong style=\"color: #1a1a3e; display: block; margin-bottom: 5px;\"\u003eGlass Thickness\u003c\/strong\u003e \u003cspan style=\"color: #4a4a4a;\"\u003e2mm\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"padding: 15px; background: linear-gradient(135deg,#f5f7fa 0,#fff 100%); border-radius: 8px; border-left: 3px solid #00d4ff;\"\u003e\n\u003cstrong style=\"color: #1a1a3e; display: block; margin-bottom: 5px;\"\u003eTransmittance\u003c\/strong\u003e \u003cspan style=\"color: #4a4a4a;\"\u003e＞90%\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"padding: 15px; background: linear-gradient(135deg,#f5f7fa 0,#fff 100%); border-radius: 8px; border-left: 3px solid #00d4ff;\"\u003e\n\u003cstrong style=\"color: #1a1a3e; display: block; margin-bottom: 5px;\"\u003eFWHM\u003c\/strong\u003e \u003cspan style=\"color: #4a4a4a;\"\u003eH-alpha (4nm) \/ SII (4nm) \/ OIII (4nm)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"padding: 15px; background: linear-gradient(135deg,#f5f7fa 0,#fff 100%); border-radius: 8px; border-left: 3px solid #00d4ff;\"\u003e\n\u003cstrong style=\"color: #1a1a3e; display: block; margin-bottom: 5px;\"\u003eGlass Material\u003c\/strong\u003e \u003cspan style=\"color: #4a4a4a;\"\u003eQuartz glass\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"padding: 15px; background: linear-gradient(135deg,#f5f7fa 0,#fff 100%); border-radius: 8px; border-left: 3px solid #00d4ff;\"\u003e\n\u003cstrong style=\"color: #1a1a3e; display: block; margin-bottom: 5px;\"\u003eFrame Material\u003c\/strong\u003e \u003cspan style=\"color: #4a4a4a;\"\u003eAluminum Alloy\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"padding: 15px; background: linear-gradient(135deg,#f5f7fa 0,#fff 100%); border-radius: 8px; border-left: 3px solid #00d4ff;\"\u003e\n\u003cstrong style=\"color: #1a1a3e; display: block; margin-bottom: 5px;\"\u003eCoating Technology\u003c\/strong\u003e \u003cspan style=\"color: #4a4a4a;\"\u003eIAD (Ion Assisted Deposition)\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"padding: 15px; background: linear-gradient(135deg,#f5f7fa 0,#fff 100%); border-radius: 8px; border-left: 3px solid #00d4ff;\"\u003e\n\u003cstrong style=\"color: #1a1a3e; display: block; margin-bottom: 5px;\"\u003eOD\u003c\/strong\u003e \u003cspan style=\"color: #4a4a4a;\"\u003e≥5.0\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-top: 25px; padding: 20px; background: #0f0f1e; border-radius: 8px;\"\u003e\n\u003ch3 style=\"color: #00d4ff; font-size: clamp(16px,3vw,20px); margin: 0 0 15px 0;\"\u003eTransmission Range:\u003c\/h3\u003e\n\u003cdiv style=\"color: #fff; font-size: clamp(13px,2.5vw,15px); line-height: 1.8;\"\u003e\n\u003cdiv style=\"margin-bottom: 8px;\"\u003e▲ H-alpha filter: Central wavelength 656.3nm\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 8px;\"\u003e▲ SII filter: Central wavelength 671.6nm\u003c\/div\u003e\n\u003cdiv\u003e▲ OIII filter: Central wavelength 500.7nm\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"text-align: center; margin-bottom: 40px;\"\u003e\u003cimg style=\"max-width: 100%; height: auto; border-radius: 8px; box-shadow: 0 4px 20px rgba(0,0,0,.1);\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/4nm_SHO_detail_02.jpg\" alt=\"Filter Details\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"background: #fff; border-radius: 12px; padding: 30px 20px; margin-bottom: 30px; box-shadow: 0 2px 10px rgba(0,0,0,.05);\"\u003e\n\u003ch2 style=\"color: #1a1a3e; font-size: clamp(20px,4vw,28px); margin: 0 0 20px 0; text-align: center;\"\u003eSpectrum Analysis\u003c\/h2\u003e\n\u003cdiv style=\"text-align: center; margin-bottom: 25px;\"\u003e\u003cimg style=\"max-width: 100%; height: auto; border-radius: 8px;\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/4nm_SHO_detail_03.jpg\" alt=\"Spectrum Chart\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"background: #f8f9fa; border-radius: 8px; padding: 20px;\"\u003e\n\u003ch3 style=\"color: #1a1a3e; font-size: clamp(16px,3vw,18px); margin: 0 0 15px 0;\"\u003eSpectral Chart Reading Tips:\u003c\/h3\u003e\n\u003cul style=\"color: #4a4a4a; font-size: clamp(13px,2.5vw,15px); line-height: 1.8; margin: 0; padding-left: 20px;\"\u003e\n\u003cli style=\"margin-bottom: 10px;\"\u003eThe horizontal axis represents the wavelength of light (in nm), and the vertical axis represents the light transmittance (in percentage %). The red line indicates Hα (656 nm), the green line indicates OIII (500.7 nm), and the blue line indicates SII (672.4 nm).\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 10px;\"\u003eThe emission nebula signal bands are mainly concentrated around 656nm (Hα), 500.7nm (OIII), and other bands.\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 10px;\"\u003eLight pollution peaks are commonly found near 540nm and 590nm (sodium lamp\/mercury lamp bands).\u003c\/li\u003e\n\u003cli\u003eThe transmission regions avoid major interference bands to ensure effective signal passage, enhancing contrast and image purity.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: linear-gradient(135deg,#1a1a3e 0,#0f0f1e 100%); border-radius: 12px; padding: 40px 20px; margin-bottom: 30px;\"\u003e\n\u003ch2 style=\"color: #fff; font-size: clamp(20px,4vw,28px); margin: 0 0 30px 0; text-align: center;\"\u003eKey Features\u003c\/h2\u003e\n\u003cdiv style=\"margin-bottom: 30px;\"\u003e\n\u003ch3 style=\"color: #00d4ff; font-size: clamp(16px,3vw,20px); margin: 0 0 15px 0;\"\u003ePrecise Band Control, Enhanced Detail Resolution\u003c\/h3\u003e\n\u003cp style=\"color: #e0e0e0; font-size: clamp(13px,2.5vw,15px); line-height: 1.8; margin: 0 0 15px 0;\"\u003ePrecise narrowband filters suppress background noise while highlighting elemental emission structures, revealing celestial stratification and fine details.\u003c\/p\u003e\n\u003cdiv style=\"background: rgba(0,212,255,.1); border-radius: 8px; padding: 15px;\"\u003e\n\u003cdiv style=\"color: #fff; font-size: clamp(13px,2.5vw,14px); line-height: 1.8;\"\u003e\n\u003cdiv style=\"margin-bottom: 8px;\"\u003e▲ Hα (656.3nm | 4nm FWHM): Optimized for hydrogen regions; primary channel for nebular morphology.\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 8px;\"\u003e▲ OIII (500.7nm | 4nm FWHM): Targets high-energy zones; reveals blue-green nebular details.\u003c\/div\u003e\n\u003cdiv\u003e▲ SII (671.6nm | 4nm FWHM): Enhances detection of faint signals; Significantly boosts contrast when combined with Hα.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 30px;\"\u003e\n\u003ch3 style=\"color: #00d4ff; font-size: clamp(16px,3vw,20px); margin: 0 0 15px 0;\"\u003eHigh-Quality Quartz Glass\u003c\/h3\u003e\n\u003cp style=\"color: #e0e0e0; font-size: clamp(13px,2.5vw,15px); line-height: 1.8; margin: 0;\"\u003eToupTek filters feature high-purity quartz glass substrates with \u0026gt;90% transmittance. They deliver exceptional blue-violet transmission and thermal stability, ideal for demanding astronomical imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 30px;\"\u003e\n\u003ch3 style=\"color: #00d4ff; font-size: clamp(16px,3vw,20px); margin: 0 0 15px 0;\"\u003eIAD Dense Coating\u003c\/h3\u003e\n\u003cp style=\"color: #e0e0e0; font-size: clamp(13px,2.5vw,15px); line-height: 1.8; margin: 0;\"\u003eUsing IAD (Ion Assisted Deposition) coating technology, which produces denser and more uniform coatings that are durable, corrosion-resistant, and have superior environmental stability.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 30px;\"\u003e\n\u003ch3 style=\"color: #00d4ff; font-size: clamp(16px,3vw,20px); margin: 0 0 15px 0;\"\u003ePrecision Coating\u003c\/h3\u003e\n\u003cp style=\"color: #e0e0e0; font-size: clamp(13px,2.5vw,15px); line-height: 1.8; margin: 0;\"\u003eToupTek filters use a proprietary multi-layer coating system—including single-sided cutoff, front AR coating, and edge blackening—to eliminate halos, minimize stray light, and ensure long-term durability.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 30px;\"\u003e\n\u003ch3 style=\"color: #00d4ff; font-size: clamp(16px,3vw,20px); margin: 0 0 15px 0;\"\u003eHigh Optical Cutoff Depth\u003c\/h3\u003e\n\u003cp style=\"color: #e0e0e0; font-size: clamp(13px,2.5vw,15px); line-height: 1.8; margin: 0;\"\u003eAll filters feature OD≥5.0 cutoff depth, blocking unwanted light to eliminate artifacts and deliver true-to-life color reproduction.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 30px;\"\u003e\n\u003ch3 style=\"color: #00d4ff; font-size: clamp(16px,3vw,20px); margin: 0 0 15px 0;\"\u003eMatte Black Edge Coating\u003c\/h3\u003e\n\u003cp style=\"color: #e0e0e0; font-size: clamp(13px,2.5vw,15px); line-height: 1.8; margin: 0;\"\u003eAll filters feature matte black edge treatment to eliminate stray light, ensuring optimal transmittance and contrast. 2\" filters feature threaded aluminum alloy frames for direct screw-in installation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003ch3 style=\"color: #00d4ff; font-size: clamp(16px,3vw,20px); margin: 0 0 15px 0;\"\u003eHighly Compatible\u003c\/h3\u003e\n\u003cp style=\"color: #e0e0e0; font-size: clamp(13px,2.5vw,15px); line-height: 1.8; margin: 0;\"\u003eAll filters use a single-piece, glue-free structure. 2\": Full-frame \u0026amp; smaller sensors. Compatible with industry-standard filter wheels: 2\": 5-hole\/ 7-hole\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #fff; border-radius: 12px; padding: 30px 20px; margin-bottom: 30px; box-shadow: 0 2px 10px rgba(0,0,0,.05);\"\u003e\n\u003ch2 style=\"color: #1a1a3e; font-size: clamp(20px,4vw,28px); margin: 0 0 30px 0; text-align: center;\"\u003ePerformance Gallery\u003c\/h2\u003e\n\u003cdiv style=\"margin-bottom: 30px;\"\u003e\n\u003cimg style=\"max-width: 100%; height: auto; border-radius: 8px; box-shadow: 0 4px 15px rgba(0,0,0,.1);\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/4nm_SHO_detail_04.jpg\" alt=\"IC5070 Astrophotography\"\u003e\n\u003cdiv style=\"background: #f8f9fa; border-radius: 8px; padding: 15px; margin-top: 15px;\"\u003e\n\u003ch4 style=\"color: #1a1a3e; font-size: clamp(14px,3vw,18px); margin: 0 0 10px 0;\"\u003eIC5070\u003c\/h4\u003e\n\u003cdiv style=\"color: #4a4a4a; font-size: clamp(12px,2.5vw,14px); line-height: 1.6;\"\u003e\n\u003cdiv\u003ePhotographer: voice | Telescope: Sky-Watcher | Mount: UMI\u003c\/div\u003e\n\u003cdiv\u003eCamera: ToupTek Astro ATR2600M | Filters: ToupTek Astro LRGB\u0026amp;SHO\u003c\/div\u003e\n\u003cdiv\u003eIntegration: Hα: 30 x 600s; SII: 30 x 600s; OIII: 30 x 600s\u003c\/div\u003e\n\u003cdiv\u003e\u003cstrong\u003eTotal exposure: 15h\u003c\/strong\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 30px;\"\u003e\n\u003cimg style=\"max-width: 100%; height: auto; border-radius: 8px; box-shadow: 0 4px 15px rgba(0,0,0,.1);\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/4nm_SHO_detail_05.jpg\" alt=\"IC 443 Astrophotography\"\u003e\n\u003cdiv style=\"background: #f8f9fa; border-radius: 8px; padding: 15px; margin-top: 15px;\"\u003e\n\u003ch4 style=\"color: #1a1a3e; font-size: clamp(14px,3vw,18px); margin: 0 0 10px 0;\"\u003eIC 443\u003c\/h4\u003e\n\u003cdiv style=\"color: #4a4a4a; font-size: clamp(12px,2.5vw,14px); line-height: 1.6;\"\u003e\n\u003cdiv\u003ePhotographer: voice\u0026amp;免贵姓姚 | Telescope: Sky-Watcher F3.4\u003c\/div\u003e\n\u003cdiv\u003eCamera: ToupTek Astro ATR2600M\/ATR2600C | Mount: UMi\u003c\/div\u003e\n\u003cdiv\u003eFilters: ToupTek Astro SHO 4nm\u003c\/div\u003e\n\u003cdiv\u003eProcessing: Narrowband combination using HSO channel mapping\u003c\/div\u003e\n\u003cdiv\u003e\u003cstrong\u003eTotal exposure: 20h\u003c\/strong\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 30px;\"\u003e\n\u003cimg style=\"max-width: 100%; height: auto; border-radius: 8px; box-shadow: 0 4px 15px rgba(0,0,0,.1);\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/4nm_SHO_detail_06.jpg\" alt=\"NGC2237 Astrophotography\"\u003e\n\u003cdiv style=\"background: #f8f9fa; border-radius: 8px; padding: 15px; margin-top: 15px;\"\u003e\n\u003ch4 style=\"color: #1a1a3e; font-size: clamp(14px,3vw,18px); margin: 0 0 10px 0;\"\u003eNGC2237\u003c\/h4\u003e\n\u003cdiv style=\"color: #4a4a4a; font-size: clamp(12px,2.5vw,14px); line-height: 1.6;\"\u003e\n\u003cdiv\u003ePhotographer: 原上行川 | Telescope: Askar SQA55\u003c\/div\u003e\n\u003cdiv\u003eCamera: ToupTek Astro ATR2600M | Mount: iOptron HAE16C\u003c\/div\u003e\n\u003cdiv\u003eFilters: ToupTek Astro SHO | Astrophotography wireless controller: StellaVita\u003c\/div\u003e\n\u003cdiv\u003eIntegration: Hα:71, OIII: 63, SII: 49\u003c\/div\u003e\n\u003cdiv\u003e\u003cstrong\u003eTotal exposure: 15h\u003c\/strong\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #f8f9fa; border-radius: 12px; padding: 30px 20px; margin-bottom: 30px;\"\u003e\n\u003ch2 style=\"color: #1a1a3e; font-size: clamp(20px,4vw,28px); margin: 0 0 20px 0; text-align: center;\"\u003eInstallation\u003c\/h2\u003e\n\u003cp style=\"color: #4a4a4a; font-size: clamp(14px,2.5vw,16px); text-align: center; margin: 0 0 20px 0;\"\u003eScrew directly into filter wheels—no front\/back orientation needed.\u003c\/p\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\u003cimg style=\"max-width: 100%; height: auto; border-radius: 8px; box-shadow: 0 4px 15px rgba(0,0,0,.1);\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/4nm_SHO_detail_07.jpg\" alt=\"Installation Guide\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: linear-gradient(135deg,#fff 0,#f8f9fa 100%); border: 2px solid #00d4ff; border-radius: 12px; padding: 30px 20px; margin-bottom: 30px;\"\u003e\n\u003ch2 style=\"color: #1a1a3e; font-size: clamp(20px,4vw,28px); margin: 0 0 20px 0; text-align: center;\"\u003eWarranty and Service\u003c\/h2\u003e\n\u003cdiv style=\"display: grid; grid-template-columns: repeat(auto-fit,minmax(280px,1fr)); gap: 20px; margin-bottom: 20px;\"\u003e\n\u003cdiv style=\"padding: 20px; background: #fff; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,.05);\"\u003e\n\u003ch3 style=\"color: #00d4ff; font-size: clamp(14px,3vw,18px); margin: 0 0 10px 0;\"\u003eQuality Assurance\u003c\/h3\u003e\n\u003cp style=\"color: #4a4a4a; font-size: clamp(13px,2.5vw,15px); line-height: 1.6; margin: 0;\"\u003eEach filter undergoes pre-delivery spectral testing and rigorous screening to ensure consistent optical performance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"padding: 20px; background: #fff; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,.05);\"\u003e\n\u003ch3 style=\"color: #00d4ff; font-size: clamp(14px,3vw,18px); margin: 0 0 10px 0;\"\u003eAfter-sales Policy\u003c\/h3\u003e\n\u003cp style=\"color: #4a4a4a; font-size: clamp(13px,2.5vw,15px); line-height: 1.6; margin: 0;\"\u003eA two-year warranty covers manufacturing defects. ToupTek Astro offers professional technical support and usage guidance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"text-align: center; padding: 20px; background: #0f0f1e; border-radius: 8px;\"\u003e\n\u003cp style=\"color: #fff; font-size: clamp(13px,2.5vw,15px); margin: 0 0 10px 0;\"\u003eFor assistance, contact our customer service or technical support:\u003c\/p\u003e\n\u003ca style=\"color: #00d4ff; text-decoration: none; font-size: clamp(14px,3vw,16px); font-weight: bold;\" href=\"https:\/\/touptek-astro.com\/supports\"\u003etouptek-astro.com\/supports\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #fff3cd; border-left: 4px solid #ffc107; border-radius: 8px; padding: 20px; margin-bottom: 30px;\"\u003e\n\u003ch3 style=\"color: #856404; font-size: clamp(16px,3vw,20px); margin: 0 0 15px 0;\"\u003eImportant Notes\u003c\/h3\u003e\n\u003cul style=\"color: #856404; font-size: clamp(13px,2.5vw,15px); line-height: 1.8; margin: 0; padding-left: 20px;\"\u003e\n\u003cli style=\"margin-bottom: 10px;\"\u003e\n\u003cstrong\u003eColor Variation:\u003c\/strong\u003e Filter coating colors may appear different under varying lighting conditions and viewing angles - this is normal optical behavior.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Improvements:\u003c\/strong\u003e We continually optimize our products, which may result in minor specification and appearance updates. Specifications are subject to change without notice. Please refer to the physical product for final details.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"ToupTek Astro","offers":[{"title":"SII Filter 4nm","offer_id":51181464813880,"sku":null,"price":209.0,"currency_code":"USD","in_stock":true},{"title":"Hα Filter 4nm","offer_id":51181464846648,"sku":null,"price":209.0,"currency_code":"USD","in_stock":true},{"title":"OIII Filter 4nm","offer_id":51181464879416,"sku":null,"price":209.0,"currency_code":"USD","in_stock":true},{"title":"SHO Filters Set 4nm","offer_id":51181464912184,"sku":null,"price":599.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/HEADERSHO4nm-01.jpg?v=1759217449"},{"product_id":"puresight-a1-dual-narrowband-filter","title":"2inch Dual Narrowband Filter","description":"\u003cdiv style=\"max-width:1200px;margin:0 auto;padding:20px\"\u003e\n\u003cdiv style=\"background:#f8f9fa;border-radius:12px;padding:30px 20px;margin-bottom:30px;box-shadow:0 2px 10px rgba(0,0,0,.05)\"\u003e\n\u003ch2 style=\"color:#1a1a3e;font-size:clamp(20px,4vw,28px);margin:0 0 20px 0;border-left:4px solid #00d4ff;padding-left:15px\"\u003eToupTek Astro PureSight A1 Dual Narrowband Filter Introduction\u003c\/h2\u003e\n\u003cp style=\"color:#4a4a4a;font-size:clamp(14px,2.5vw,16px);line-height:1.8;margin:0\"\u003eToupTek Astro PureSight A1 Hα \u0026amp; OIII Dual Narrowband Filter is designed for deep-sky astrophotography under light-polluted skies. With a precise 5nm bandpass and optimization for fast optical systems, it enhances nebula contrast while effectively suppressing unwanted background light.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"text-align:center;margin-bottom:40px\"\u003e\u003cimg style=\"max-width:100%;height:auto;border-radius:8px;box-shadow:0 4px 20px rgba(0,0,0,.1)\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/touptek-puresight-a1-dual-narrowband-filter-hero.jpg\" alt=\"ToupTek Astro PureSight A1 Dual Narrowband Filter\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"background:#fff;border-radius:12px;padding:30px 20px;margin-bottom:30px;box-shadow:0 2px 10px rgba(0,0,0,.05)\"\u003e\n\u003ch2 style=\"color:#1a1a3e;font-size:clamp(20px,4vw,28px);margin:0 0 20px 0;border-left:4px solid #00d4ff;padding-left:15px\"\u003eUser Gallery\u003c\/h2\u003e\n\u003cdiv style=\"margin-bottom:30px\"\u003e\n\u003cdiv style=\"background:#f8f9fa;border-radius:8px;padding:15px;margin-bottom:15px\"\u003e\n\u003ch4 style=\"color:#1a1a3e;font-size:clamp(14px,3vw,18px);margin:0 0 10px 0\"\u003eSH2-308 (Bortle 4.9)\u003c\/h4\u003e\n\u003cdiv style=\"color:#4a4a4a;font-size:clamp(12px,2.5vw,14px);line-height:1.6\"\u003e\n\u003cdiv\u003eCr. Pai Xing Kong De T\u003c\/div\u003e\n\u003cdiv\u003eTelescope: SKY ROVER 70SA\u003c\/div\u003e\n\u003cdiv\u003eCamera: ASI2600MC\u003c\/div\u003e\n\u003cdiv\u003eFilter: ToupTek Astro PureSight A1 Hα \u0026amp; [OIII] 5nm F\/3.2\u003c\/div\u003e\n\u003cdiv\u003eExposure: 10h of Hα \u0026amp; OIII + 1.5h RGB stars\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cimg style=\"max-width:100%;height:auto;border-radius:8px;box-shadow:0 4px 15px rgba(0,0,0,.1)\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/dual-narrowband-filter-SH2-308.jpg\" alt=\"SH2-308 Astrophotography\"\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv style=\"background:#f8f9fa;border-radius:8px;padding:15px;margin-bottom:15px\"\u003e\n\u003ch4 style=\"color:#1a1a3e;font-size:clamp(14px,3vw,18px);margin:0 0 10px 0\"\u003eRosette Nebula (Full Moon)\u003c\/h4\u003e\n\u003cdiv style=\"color:#4a4a4a;font-size:clamp(12px,2.5vw,14px);line-height:1.6\"\u003e\n\u003cdiv\u003eCr. Pai Xing Kong De T\u003c\/div\u003e\n\u003cdiv\u003eTelescope: SKY ROVER 70SA\u003c\/div\u003e\n\u003cdiv\u003eCamera: ASI2600MC\u003c\/div\u003e\n\u003cdiv\u003eFilter: ToupTek Astro PureSight A1 Hα \u0026amp; [OIII] 5nm F\/3.2\u003c\/div\u003e\n\u003cdiv\u003eExposure: 300s × 49, 4.8h in total\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cimg style=\"max-width:100%;height:auto;border-radius:8px;box-shadow:0 4px 15px rgba(0,0,0,.1)\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/dual-narrowband-filter-rosette-nebula.jpg\" alt=\"Rosette Nebula Astrophotography\"\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#fff;border:1px solid #e0e0e0;border-radius:12px;padding:30px 20px;margin-bottom:30px\"\u003e\n\u003ch2 style=\"color:#1a1a3e;font-size:clamp(20px,4vw,28px);margin:0 0 20px 0;border-left:4px solid #00d4ff;padding-left:15px\"\u003eWhat is a Dual Narrowband Filter?\u003c\/h2\u003e\n\u003cp style=\"color:#4a4a4a;font-size:clamp(14px,2.5vw,16px);line-height:1.8;margin:0 0 15px 0\"\u003eA dual narrowband filter is an astrophotography filter designed to isolate specific emission wavelengths, typically hydrogen-alpha (Hα) and oxygen III (OIII). By transmitting only these narrow spectral bands, the filter significantly enhances the visibility of emission nebulae while suppressing background light pollution.\u003c\/p\u003e\n\u003cp style=\"color:#4a4a4a;font-size:clamp(14px,2.5vw,16px);line-height:1.8;margin:0\"\u003eDual narrowband filters are widely used for deep-sky astrophotography, especially when imaging nebulae from urban or suburban locations where sky brightness can reduce contrast.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:linear-gradient(135deg,#1a1a3e 0,#0f0f1e 100%);border-radius:12px;padding:40px 20px;margin-bottom:30px\"\u003e\n\u003ch2 style=\"color:#fff;font-size:clamp(20px,4vw,28px);margin:0 0 20px 0;border-left:4px solid #00d4ff;padding-left:15px\"\u003eHigh-Performance Dual Narrowband Filter for Fast Optical Systems\u003c\/h2\u003e\n\u003cp style=\"color:#e0e0e0;font-size:clamp(13px,2.5vw,15px);line-height:1.8;margin:0 0 15px 0\"\u003eToupTek Astro PureSight A1 Hα \u0026amp; OIII Dual Narrowband 5nm F\/3.2 Astronomical Filter is engineered specifically for astrophotography with fast optical systems.\u003c\/p\u003e\n\u003cp style=\"color:#e0e0e0;font-size:clamp(13px,2.5vw,15px);line-height:1.8;margin:0 0 15px 0\"\u003eWith precisely controlled \u003cstrong\u003e5nm FWHM bandpasses\u003c\/strong\u003e and center wavelengths optimized for fast optics, the filter delivers excellent performance on systems from \u003cstrong\u003eF\/3.2 and faster\u003c\/strong\u003e, achieving an ideal balance between strong light-pollution suppression and high signal transmission.\u003c\/p\u003e\n\u003cp style=\"color:#e0e0e0;font-size:clamp(13px,2.5vw,15px);line-height:1.8;margin:0\"\u003eAdvanced anti-reflection coatings and carefully controlled surface precision significantly reduce internal reflections, effectively suppressing halos and ghosting. The result is clean backgrounds, high contrast, and sharp stars, even when imaging from urban or suburban locations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#fff;border:1px solid #e0e0e0;border-radius:12px;padding:30px 20px;margin-bottom:30px\"\u003e\n\u003ch2 style=\"color:#1a1a3e;font-size:clamp(20px,4vw,28px);margin:0 0 25px 0;border-left:4px solid #00d4ff;padding-left:15px\"\u003eTechnical Parameters\u003c\/h2\u003e\n\u003cdiv style=\"overflow-x:auto\"\u003e\u003ctable style=\"width:100%;border-collapse:collapse;font-size:clamp(13px,2.5vw,15px);table-layout:fixed\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"width:33.33%;padding:12px;border:1px solid #e0e0e0;background:#f8f9fa;font-weight:700;color:#1a1a3e;vertical-align:top;word-break:break-word;overflow-wrap:break-word\"\u003eProduct Name\u003c\/td\u003e\n\u003ctd style=\"width:66.67%;padding:12px;border:1px solid #e0e0e0;color:#4a4a4a;vertical-align:top;word-break:break-word;overflow-wrap:break-word\"\u003ePureSight A1 Hα \u0026amp; [OIII] Dual Narrowband 5nm F\/3.2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width:33.33%;padding:12px;border:1px solid #e0e0e0;background:#f8f9fa;font-weight:700;color:#1a1a3e;vertical-align:top;word-break:break-word;overflow-wrap:break-word\"\u003eTarget Emission Lines\u003c\/td\u003e\n\u003ctd style=\"width:66.67%;padding:12px;border:1px solid #e0e0e0;color:#4a4a4a;vertical-align:top;word-break:break-word;overflow-wrap:break-word\"\u003eHα 656.3nm \u0026amp; [OIII] 500.7nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width:33.33%;padding:12px;border:1px solid #e0e0e0;background:#f8f9fa;font-weight:700;color:#1a1a3e;vertical-align:top;word-break:break-word;overflow-wrap:break-word\"\u003eFWHM\u003c\/td\u003e\n\u003ctd style=\"width:66.67%;padding:12px;border:1px solid #e0e0e0;color:#4a4a4a;vertical-align:top;word-break:break-word;overflow-wrap:break-word\"\u003e5.0nm ± 1.2 \/ 5.0nm ± 1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width:33.33%;padding:12px;border:1px solid #e0e0e0;background:#f8f9fa;font-weight:700;color:#1a1a3e;vertical-align:top;word-break:break-word;overflow-wrap:break-word\"\u003eTransmission Rate\u003c\/td\u003e\n\u003ctd style=\"width:66.67%;padding:12px;border:1px solid #e0e0e0;color:#4a4a4a;vertical-align:top;word-break:break-word;overflow-wrap:break-word\"\u003e≥90%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width:33.33%;padding:12px;border:1px solid #e0e0e0;background:#f8f9fa;font-weight:700;color:#1a1a3e;vertical-align:top;word-break:break-word;overflow-wrap:break-word\"\u003eOD\u003c\/td\u003e\n\u003ctd style=\"width:66.67%;padding:12px;border:1px solid #e0e0e0;color:#4a4a4a;vertical-align:top;word-break:break-word;overflow-wrap:break-word\"\u003e≥5 @ 200-1100nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width:33.33%;padding:12px;border:1px solid #e0e0e0;background:#f8f9fa;font-weight:700;color:#1a1a3e;vertical-align:top;word-break:break-word;overflow-wrap:break-word\"\u003eSubstrate\u003c\/td\u003e\n\u003ctd style=\"width:66.67%;padding:12px;border:1px solid #e0e0e0;color:#4a4a4a;vertical-align:top;word-break:break-word;overflow-wrap:break-word\"\u003eFused Silica\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width:33.33%;padding:12px;border:1px solid #e0e0e0;background:#f8f9fa;font-weight:700;color:#1a1a3e;vertical-align:top;word-break:break-word;overflow-wrap:break-word\"\u003eThickness\u003c\/td\u003e\n\u003ctd style=\"width:66.67%;padding:12px;border:1px solid #e0e0e0;color:#4a4a4a;vertical-align:top;word-break:break-word;overflow-wrap:break-word\"\u003e2.00mm ± 0.1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width:33.33%;padding:12px;border:1px solid #e0e0e0;background:#f8f9fa;font-weight:700;color:#1a1a3e;vertical-align:top;word-break:break-word;overflow-wrap:break-word\"\u003eParallelism\u003c\/td\u003e\n\u003ctd style=\"width:66.67%;padding:12px;border:1px solid #e0e0e0;color:#4a4a4a;vertical-align:top;word-break:break-word;overflow-wrap:break-word\"\u003e≤ 30\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width:33.33%;padding:12px;border:1px solid #e0e0e0;background:#f8f9fa;font-weight:700;color:#1a1a3e;vertical-align:top;word-break:break-word;overflow-wrap:break-word\"\u003eSurface Quality\u003c\/td\u003e\n\u003ctd style=\"width:66.67%;padding:12px;border:1px solid #e0e0e0;color:#4a4a4a;vertical-align:top;word-break:break-word;overflow-wrap:break-word\"\u003e60\/40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width:33.33%;padding:12px;border:1px solid #e0e0e0;background:#f8f9fa;font-weight:700;color:#1a1a3e;vertical-align:top;word-break:break-word;overflow-wrap:break-word\"\u003eRecommended F-ratio\u003c\/td\u003e\n\u003ctd style=\"width:66.67%;padding:12px;border:1px solid #e0e0e0;color:#4a4a4a;vertical-align:top;word-break:break-word;overflow-wrap:break-word\"\u003e≥ F\/3.2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width:33.33%;padding:12px;border:1px solid #e0e0e0;background:#f8f9fa;font-weight:700;color:#1a1a3e;vertical-align:top;word-break:break-word;overflow-wrap:break-word\"\u003eCoating\u003c\/td\u003e\n\u003ctd style=\"width:66.67%;padding:12px;border:1px solid #e0e0e0;color:#4a4a4a;vertical-align:top;word-break:break-word;overflow-wrap:break-word\"\u003eIAD (Ion Deposition)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width:33.33%;padding:12px;border:1px solid #e0e0e0;background:#f8f9fa;font-weight:700;color:#1a1a3e;vertical-align:top;word-break:break-word;overflow-wrap:break-word\"\u003eSize\u003c\/td\u003e\n\u003ctd style=\"width:66.67%;padding:12px;border:1px solid #e0e0e0;color:#4a4a4a;vertical-align:top;word-break:break-word;overflow-wrap:break-word\"\u003e2-inch (frame height: 5mm, thread height: 2mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width:33.33%;padding:12px;border:1px solid #e0e0e0;background:#f8f9fa;font-weight:700;color:#1a1a3e;vertical-align:top;word-break:break-word;overflow-wrap:break-word\"\u003eThread\u003c\/td\u003e\n\u003ctd style=\"width:66.67%;padding:12px;border:1px solid #e0e0e0;color:#4a4a4a;vertical-align:top;word-break:break-word;overflow-wrap:break-word\"\u003eM48×0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width:33.33%;padding:12px;border:1px solid #e0e0e0;background:#f8f9fa;font-weight:700;color:#1a1a3e;vertical-align:top;word-break:break-word;overflow-wrap:break-word\"\u003eFrame Material\u003c\/td\u003e\n\u003ctd style=\"width:66.67%;padding:12px;border:1px solid #e0e0e0;color:#4a4a4a;vertical-align:top;word-break:break-word;overflow-wrap:break-word\"\u003eAluminum Alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width:33.33%;padding:12px;border:1px solid #e0e0e0;background:#f8f9fa;font-weight:700;color:#1a1a3e;vertical-align:top;word-break:break-word;overflow-wrap:break-word\"\u003eClear Aperture\u003c\/td\u003e\n\u003ctd style=\"width:66.67%;padding:12px;border:1px solid #e0e0e0;color:#4a4a4a;vertical-align:top;word-break:break-word;overflow-wrap:break-word\"\u003e43.9mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width:33.33%;padding:12px;border:1px solid #e0e0e0;background:#f8f9fa;font-weight:700;color:#1a1a3e;vertical-align:top;word-break:break-word;overflow-wrap:break-word\"\u003eInstallation Direction\u003c\/td\u003e\n\u003ctd style=\"width:66.67%;padding:12px;border:1px solid #e0e0e0;color:#4a4a4a;vertical-align:top;word-break:break-word;overflow-wrap:break-word\"\u003eThreaded side toward the sensor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#fff;border-radius:12px;padding:30px 20px;margin-bottom:30px;box-shadow:0 2px 10px rgba(0,0,0,.05)\"\u003e\n\u003ch2 style=\"color:#1a1a3e;font-size:clamp(20px,4vw,28px);margin:0 0 20px 0;border-left:4px solid #00d4ff;padding-left:15px\"\u003eTransmission Spectrum\u003c\/h2\u003e\n\u003cdiv style=\"text-align:center;margin-bottom:20px\"\u003e\u003cimg style=\"max-width:100%;height:auto;border-radius:8px\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/touptek-dual-narrowband-filter-transmission-spectrum.jpg\" alt=\"Transmission Spectrum\"\u003e\u003c\/div\u003e\n\u003cp style=\"color:#4a4a4a;font-size:clamp(14px,2.5vw,16px);line-height:1.8;margin:0\"\u003eToupTek Astro PureSight A1 5nm Hα \u0026amp; [OIII] Dual Narrowband Filter features high transmission in both the Hα and [OIII] emission bands, while deeply blocking common light-pollution wavelengths. From fast optical systems to standard focal ratios, it extracts clean, high signal-to-noise nebular data for astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:linear-gradient(135deg,#1a1a3e 0,#0f0f1e 100%);border-radius:12px;padding:40px 20px;margin-bottom:30px\"\u003e\n\u003ch2 style=\"color:#fff;font-size:clamp(20px,4vw,28px);margin:0 0 25px 0;border-left:4px solid #00d4ff;padding-left:15px\"\u003eKey Features\u003c\/h2\u003e\n\u003cdiv style=\"margin-bottom:30px\"\u003e\n\u003ch3 style=\"color:#00d4ff;font-size:clamp(16px,3vw,20px);margin:0 0 15px 0\"\u003eReduce Light Pollution with Precise Narrowband Control\u003c\/h3\u003e\n\u003cp style=\"color:#e0e0e0;font-size:clamp(13px,2.5vw,15px);line-height:1.8;margin:0 0 15px 0\"\u003eAstrophotographers often face challenges when imaging from urban or suburban locations where artificial lighting reduces contrast and washes out faint nebula structures.\u003c\/p\u003e\n\u003cp style=\"color:#e0e0e0;font-size:clamp(13px,2.5vw,15px);line-height:1.8;margin:0 0 15px 0\"\u003eThe ToupTek Astro PureSight A1 dual narrowband filter features a 5nm ultra-narrow FWHM bandpass precisely tuned to isolate Hα (656.3nm) and [OIII] (500.7nm) emission lines. This allows key nebula signals to pass through while effectively blocking most sources of artificial light pollution.\u003c\/p\u003e\n\u003cp style=\"color:#e0e0e0;font-size:clamp(13px,2.5vw,15px);line-height:1.8;margin:0 0 15px 0\"\u003eWith a blocking depth of OD ≥5 (0.001% transmission), the filter suppresses over 99.999% of unwanted light, including streetlights, neon lighting, and urban skyglow.\u003c\/p\u003e\n\u003cdiv style=\"background:rgba(0,212,255,.1);border-radius:8px;padding:15px\"\u003e\u003cdiv style=\"color:#fff;font-size:clamp(13px,2.5vw,14px);line-height:1.8\"\u003e\n\u003cdiv style=\"margin-bottom:8px\"\u003e▲ Higher-contrast nebula structures\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:8px\"\u003e▲ Cleaner and darker background sky\u003c\/div\u003e\n\u003cdiv\u003e▲ Improved signal-to-noise ratio (SNR)\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:30px\"\u003e\n\u003ch3 style=\"color:#00d4ff;font-size:clamp(16px,3vw,20px);margin:0 0 15px 0\"\u003eIdeal for Emission Nebula Imaging\u003c\/h3\u003e\n\u003cp style=\"color:#e0e0e0;font-size:clamp(13px,2.5vw,15px);line-height:1.8;margin:0 0 15px 0\"\u003eDual narrowband filters are particularly effective when capturing emission nebulae that radiate strongly in Hα and OIII wavelengths.\u003c\/p\u003e\n\u003cdiv style=\"background:rgba(0,212,255,.1);border-radius:8px;padding:15px\"\u003e\u003cdiv style=\"color:#fff;font-size:clamp(13px,2.5vw,14px);line-height:1.8\"\u003e\n\u003cdiv style=\"margin-bottom:8px\"\u003e▲ Orion Nebula (M42)\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:8px\"\u003e▲ Rosette Nebula\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:8px\"\u003e▲ Lagoon Nebula (M8)\u003c\/div\u003e\n\u003cdiv\u003e▲ Veil Nebula\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cp style=\"color:#e0e0e0;font-size:clamp(13px,2.5vw,15px);line-height:1.8;margin:15px 0 0 0\"\u003eWhen paired with a \u003cstrong\u003emonochrome or color astronomy camera\u003c\/strong\u003e, the filter enhances faint nebula structures while maintaining natural star colors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003ch3 style=\"color:#00d4ff;font-size:clamp(16px,3vw,20px);margin:0 0 15px 0\"\u003eHigh Compatibility\u003c\/h3\u003e\n\u003cp style=\"color:#e0e0e0;font-size:clamp(13px,2.5vw,15px);line-height:1.8;margin:0\"\u003eStandard M48×0.75 thread, compatible with filter wheels and filter drawers. The 2-inch format is suitable for full-frame and smaller color astronomy cameras.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#fff;border-radius:12px;padding:30px 20px;margin-bottom:30px;box-shadow:0 2px 10px rgba(0,0,0,.05)\"\u003e\n\u003ch2 style=\"color:#1a1a3e;font-size:clamp(20px,4vw,28px);margin:0 0 20px 0;border-left:4px solid #00d4ff;padding-left:15px\"\u003eExceptional Image Purity\u003c\/h2\u003e\n\u003cp style=\"color:#4a4a4a;font-size:clamp(14px,2.5vw,16px);line-height:1.8;margin:0 0 15px 0\"\u003e\u003cstrong\u003eHalo-free performance with premium optical materials\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv style=\"color:#4a4a4a;font-size:clamp(13px,2.5vw,15px);line-height:1.8;margin-bottom:20px\"\u003e\n\u003cdiv style=\"margin-bottom:8px\"\u003e• High-purity fused silica substrate combined with IAD (Ion Assisted Deposition) coating for dense and uniform layers.\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:8px\"\u003e• Advanced anti-reflection coatings significantly reduce internal reflections, halos, and ghosting.\u003c\/div\u003e\n\u003cdiv\u003e• ≥90% peak transmission, ≤30\" parallelism, and 60\/40 surface quality ensure a clean background and sharp stars.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp style=\"color:#4a4a4a;font-size:clamp(14px,2.5vw,16px);line-height:1.8;margin:0 0 20px 0\"\u003eCapture faint nebula details even from urban balconies or city skies.\u003c\/p\u003e\n\u003cdiv style=\"text-align:center\"\u003e\u003cimg style=\"max-width:100%;height:auto;border-radius:8px;box-shadow:0 4px 15px rgba(0,0,0,.1)\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/touptek-dual-narrowband-filter-exceptional-image-purity.jpg\" alt=\"Exceptional Image Purity\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#f8f9fa;border-radius:12px;padding:30px 20px;margin-bottom:30px\"\u003e\n\u003ch2 style=\"color:#1a1a3e;font-size:clamp(20px,4vw,28px);margin:0 0 20px 0;border-left:4px solid #00d4ff;padding-left:15px\"\u003eInstallation\u003c\/h2\u003e\n\u003cp style=\"color:#4a4a4a;font-size:clamp(14px,2.5vw,16px);text-align:center;line-height:1.8;margin:0 0 15px 0\"\u003eToupTek Astro PureSight A1 5nm Hα \u0026amp; [OIII] Dual Narrowband Filter features a specialized coating process that eliminates the need to identify front or back—simply screw it in for quick and easy installation.\u003c\/p\u003e\n\u003cp style=\"color:#4a4a4a;font-size:clamp(14px,2.5vw,16px);text-align:center;line-height:1.8;margin:0 0 20px 0\"\u003eThe filter comes standard with a 2-inch housing and M48×0.75 thread, ensuring direct compatibility with most astrophotography accessories. During installation, please ensure that the threaded side faces the camera sensor.\u003c\/p\u003e\n\u003cdiv style=\"text-align:center\"\u003e\u003cimg style=\"max-width:100%;height:auto;border-radius:8px;box-shadow:0 4px 15px rgba(0,0,0,.1)\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/touptek-dual-narrowband-filter-installation.jpg\" alt=\"Installation Guide\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"ToupTek Astro","offers":[{"title":"Default Title","offer_id":51882609934648,"sku":null,"price":289.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0833\/1532\/7288\/files\/touptek-dual-narrowband-filter-back.jpg?v=1773311802"}],"url":"https:\/\/www.touptekastro.com\/en-eu\/collections\/astrophotography-filters.oembed","provider":"ToupTek Astro","version":"1.0","type":"link"}