Description
The SVBONY SV220 3nm Dual Narrowband Filter (H-Alpha & OIII) is engineered for deep-sky astrophotography in both light-polluted and dark-sky environments.
Featuring an ultra-narrow 3 ± 1 nm bandwidth for both Ha (656.3 nm) and OIII (500.7 nm), the filter dramatically increases contrast and signal-to-noise ratio by suppressing skyglow, stray light, and major light-pollution bands from 300–1050 nm.
Whether you're imaging emission nebulae, planetary nebulae, or rich Ha/OIII structures, the SV220 delivers high transmission (>85%), minimal halos, and crisp detail. Its premium multi-layer coatings ensure excellent color accuracy and balanced star profiles — even with fast optics.
Available in 1.25" and 2" formats.
Key Features
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Ultra-narrow 3nm (Ha + OIII) dual band – Ideal for emission & planetary nebulae
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Minimal halo multi-layer coating – Reduces glare, boosts contrast & color accuracy
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High peak transmission (≥85%) – Shorter exposures, stronger signal
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OD5 light-pollution suppression – Blocks UV, visible LP, and NIR up to 1050 nm
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Great for heavy light pollution – Excellent performance in Bortle 7–9 cities
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Compatible with all major astro cameras and filter wheels
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Full-frame compatible (2") – Reduced vignetting with wide-angle lenses
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Precision optical quality – λ/4 wavefront, 60/40 surface quality, 30″ parallelism
Variants:
⭐ W9198A – SV220 1.25" 3nm Dual Narrowband Filter
Specifications
| Item | Value |
|---|---|
| Size | 1.25" |
| Mirror Ring Size | Φ31.75 × 7 mm |
| Thread Type | Male |
| Thread Spec | M28.5 × 0.6 |
| Material | 6061-T Aluminum |
| Substrate Thickness | 2.0 mm |
| Clear Aperture | 26 mm |
| Center Wavelengths | 500.7 nm & 656.3 nm |
| Bandwidth (FWHM) | 3 ± 1 nm (Ha & OIII) |
| Cutoff Wavelength | 300–1050 nm |
| Cutoff Depth | Average OD5 |
| Peak Transmission | ≥85% |
| Surface Quality | 60/40 |
| Wavefront | PV ≤ λ/4 |
| Parallelism | 30″ |
| Weight | 7 g |
⭐ W9198B – SV220 2" 3nm Dual Narrowband Filter
Specifications
| Item | Value |
|---|---|
| Size | 2" |
| Mirror Ring Size | Φ50.8 × 7 mm |
| Thread Type | Male |
| Thread Spec | M48 × 0.75 |
| Material | 6061-T Aluminum |
| Substrate Thickness | 2.0 mm |
| Clear Aperture | 44 mm |
| Center Wavelengths | 500.7 nm & 656.3 nm |
| Bandwidth (FWHM) | 3 ± 1 nm (Ha & OIII) |
| Cutoff Wavelength | 300–1050 nm |
| Cutoff Depth | Average OD5 |
| Peak Transmission | ≥85% |
| Surface Quality | 60/40 |
| Wavefront | PV ≤ λ/4 |
| Parallelism | 30″ |
| Weight | 12.5 g |
Performance
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Sharp nebula structure with excellent contrast
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Reduced star halos due to precision coating design
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Improved color purity for Ha/OIII composite imaging
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Works exceptionally well with fast refractors, Newtonians, and astrographs
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Suitable for OSC, mono cameras, and full-frame sensors
What’s Included
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SVBONY SV220 3nm Dual Narrowband Filter
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Protective plastic filter case
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Factory inspection certificate
Ideal For
✔ Emission Nebulae
✔ Planetary Nebulae
✔ Supernova Remnants
✔ Star-forming Regions
✔ Urban Light-Polluted Imaging
✔ Fast Optics (f/2–f/7)
Additional Resources