SVBONY SV220 2" 3nm Narrowband Filter – H-Alpha & OIII for Astrophotography
SVBONY SV220 2" 3nm Narrowband Filter – H-Alpha & OIII for Astrophotography
🚚 Ships direct from the official SVBONY warehouse in China • No customs fees or surprise import charges
Ultra-Narrow 3nm Dual-Band Filter – Ideal for Emission and Planetary Nebulae
The SVBONY SV220 2" 3nm Narrowband Filter is designed for high-contrast deep-sky astrophotography, targeting H-Alpha (656.3nm) and OIII (500.7nm) emission lines with an ultra-narrow bandwidth of just 3nm. This filter uses multi-layer minimal-halo coating technology to minimize glare and halos, significantly improving contrast, color accuracy, and detail sharpness in your images. It effectively blocks unwanted wavelengths, such as light pollution and stray light, ensuring crisp, clean views of nebulae and galaxies even in urban environments.
Designed for full-frame sensors, this filter reduces vignetting in ultra-wide-angle lenses and ensures uniform brightness from edge to edge, allowing you to capture the full beauty of deep-sky objects.
Key Features
- Ultra-Narrow 3nm Bandwidth: Perfect for capturing emission and planetary nebulae with exceptional detail and contrast.
- Minimal-Halo Coating: Reduces glare and halos, enhancing image purity and color accuracy.
- Full-Frame Compatibility: Optimized for full-frame telescopes and cameras, minimizing vignetting.
- Standard M48×0.75 Thread: Fits most 2" astrophotography setups with a barrel size of Φ50.8 × 7 mm.
- High Transmission Rate: ≥85% average transmission for H-Alpha and OIII, ensuring bright and detailed images.
- Blocking Range: 300–1050nm with OD5 blocking depth, effectively suppressing unwanted light.
Technical Specifications
| Feature | Specification |
|---|---|
| Product Size | 2" |
| Barrel Dimensions | Φ50.8 × 7 mm |
| Thread Type | Single Thread / External Thread |
| Thread Specification | M48 × 0.75 mm |
| Material | 6061T Aluminum Extrusion |
| Substrate Thickness | 2.0 mm |
| Clear Aperture | 44 mm |
| Central Wavelengths | 500.7 nm (OIII) / 656.3 nm (H-Alpha) |
| Maximum Transmission | ≥85% (OIII & H-Alpha average) |
| Bandwidth (FWHM) | 3 ± 1 nm (for both OIII and H-Alpha) |
| Blocking Wavelength Range | 300–1050 nm |
| Blocking Depth | Average OD5 |
| Surface Quality | 60/40 |
| Surface Flatness | Transmitted Wavefront PV ≤ λ/4 |
| Parallelism | 30 arcseconds |
| Net Weight | 12.5 g |
What’s in the Box?
1x SVBONY SV220 2" 3nm H-Alpha & OIII Narrowband Filter
1x Protective Case
Compatibility
- 2" Filter Holders (M48×0.75 thread)
- Full-frame and APS-C cameras
- Most astronomical telescopes and imaging setups
- Ideal for deep-sky objects such as the Orion Nebula, Eagle Nebula, and Horsehead Nebula
Why Choose the SVBONY SV220 2" 3nm Filter?
- Superior Contrast: The 3nm bandwidth isolates emission lines, enhancing nebula details and improving signal-to-noise ratio.
- Light Pollution Suppression: Blocks urban skyglow and stray light, allowing for sharp images even in light-polluted areas.
- Minimal Halo Design: Reduces glare and halos, ensuring clean and accurate colors.
- Durable Construction: Made from high-quality 6061T aluminum, ensuring long-lasting performance.
- Easy to Use: Simply screw it into your 2" filter holder or telescope for instant results.
Perfect For
- Astrophotographers capturing emission and planetary nebulae
- Users in light-polluted areas seeking high-contrast images
- Setups requiring full-frame compatibility and minimal vignetting
- Those needing high transmission and blocking depth for detailed deep-sky imaging
