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SHO-2-inch-4nm
Precision Narrowband Filter
ToupTek Astro SHO Narrowband Filter Introduction
Narrowband 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.
Technical Parameters
Transmission Range:
Spectrum Analysis
Spectral Chart Reading Tips:
- The 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).
- The emission nebula signal bands are mainly concentrated around 656nm (Hα), 500.7nm (OIII), and other bands.
- Light pollution peaks are commonly found near 540nm and 590nm (sodium lamp/mercury lamp bands).
- The transmission regions avoid major interference bands to ensure effective signal passage, enhancing contrast and image purity.
Key Features
Precise Band Control, Enhanced Detail Resolution
Precise narrowband filters suppress background noise while highlighting elemental emission structures, revealing celestial stratification and fine details.
High-Quality Quartz Glass
ToupTek filters feature high-purity quartz glass substrates with >90% transmittance. They deliver exceptional blue-violet transmission and thermal stability, ideal for demanding astronomical imaging.
IAD Dense Coating
Using IAD (Ion Assisted Deposition) coating technology, which produces denser and more uniform coatings that are durable, corrosion-resistant, and have superior environmental stability.
Precision Coating
ToupTek 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.
High Optical Cutoff Depth
All filters feature OD≥5.0 cutoff depth, blocking unwanted light to eliminate artifacts and deliver true-to-life color reproduction.
Matte Black Edge Coating
All 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.
Highly Compatible
All filters use a single-piece, glue-free structure. 2": Full-frame & smaller sensors. Compatible with industry-standard filter wheels: 2": 5-hole/ 7-hole
Performance Gallery
IC5070
IC 443
NGC2237
Installation
Screw directly into filter wheels—no front/back orientation needed.
Warranty and Service
Quality Assurance
Each filter undergoes pre-delivery spectral testing and rigorous screening to ensure consistent optical performance.
After-sales Policy
A two-year warranty covers manufacturing defects. ToupTek Astro offers professional technical support and usage guidance.
For assistance, contact our customer service or technical support:
touptek-astro.com/supportsImportant Notes
- Color Variation: Filter coating colors may appear different under varying lighting conditions and viewing angles - this is normal optical behavior.
- Product Improvements: 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.
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