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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⚡ Shipped: 72 hrs after ordering (Pre-sale products excluded).
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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.
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| 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 |
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