Narrowband Filter 3nm H-Alpha & OIII SV220 2inch | Svbony
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Key Features
The SV220 2-inch 3nm filter is ideal for capturing emission lines like Hα, OIII, and SII, offering narrowband transmission for high-contrast, detailed deep-sky images.
With its 3nm bandwidth, the filter ensures superior light transmission while blocking unwanted wavelengths, improving image quality and enhancing the signal-to-noise ratio.
The 2-inch size and M48x0.75 thread make the SV220 filter compatible with a wide range of telescopes and imaging setups, offering flexibility for astrophotography.
Built from high-quality optical glass with durable coatings, the SV220 filter ensures long-lasting performance in astrophotography, even under demanding conditions.
The SV220 2-inch 3nm filter is specifically designed for deep-sky imaging, providing clarity and contrast for capturing nebulae and galaxies in stunning detail.
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SV220 2inch 3nm Narrowband filter
Minimal Halo Coating Design
This narrowband filter Adopts multi-layer minimal halo coating technology, it reduces glare and halo interference. It thereby enhances image contrast and color accuracy, presents sharp celestial details against a clean background, and improves the purity of deep-sky photography images.
Full-Frame Compatible + Ultra-Wide-Angle Adaptable
This light pollution filter is specially designed for full-frame sensors, compatible with mainstream astronomical cameras. It effectively reduces vignetting in ultra-wide-angle lenses, ensuring uniform brightness from the edge to the center of the image and presenting the complete view of nebulae and galaxies.
Customer Reviews
Benni
Feb 19, 2026
Absolutely stunning Filter. Really good quality with no halos. Tested with 500s subs on f6.9. Absolutely recommendable!
| Product Size | 2 inches |
| Mirror Ring Dimensions | Φ50.8 × 7 mm |
| Thread Type | Single Thread/Male Thread |
| Thread Specifications | M48 × 0.75 mm |
| Material | 6061T Aluminum Extrusion |
| Substrate Thickness | 2.0 mm |
| Light Transmission Aperture | 44 mm |
| Center Wavelength | 500.7/656.3 nm |
| Peak Transmittance | OIII, H-alpha average ≥85% |
| Bandwidth/Full Width at Half Maximum | OIII 3±1 nm, Ha 3±1 nm |
| Cutoff Wavelength | 300–1050 nm |
| Cutoff Depth | Average OD5 |
| Surface Quality | 60/40 |
| Surface Flatness | Transmitted Wavefront PV ≤ λ/4a |
| Parallelism | 30″ |
| Net Weight | 12.5g |
Real-shot Images:
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