{"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\/ja-eu\/products\/puresight-a1-dual-narrowband-filter","provider":"ToupTek Astro","version":"1.0","type":"link"}