Product Detail
Narrowband Filter 3nm H-Alpha & OIII for astrophotography SV220 2inch SVBONY
- Ultra-narrow 3nm (H-Alpha & OIII) bandwidth, ideal for photographing emission and planetary nebulae;
- Minimal halo coating design, effectively blocking excess light and reducing halos;
- Features an M48×0.75 thread and a lens barrel size of Φ50.8×7mm. Compatible with mainstream photographic equipment;
- Perfectly compatible with full-frame telescopes and cameras.
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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