| Features | Astronomical Telescopes Filter Professional |
|---|---|
| To Fit | Refractor, Reflector |
| Brand | SVBONY |
| Type | Filter |
| Bandwidth/FWHM | OIII 3nm Ha 3nm |
| Cutoff wavelength | 300-1050nm |
| Center wavelength | 500.7/656.3nm |
| Cut-off depth | average OD5 |
| Aperture of light transmission | 44mm |
| Substrate thickness | 2.0mm |
| Surface quality | 60/40 |
| Surface flatness | transmitted wave front PV≤λ/4a |
| Parallelism | 30″ |
| Thread type | Single thread / Male thread |
| Thread specification | M48*0.75mm |
| Material | 6061T aluminum profile |
| Country of Origin | China |
| Size | 2.0 in |
Check the listing for details. SVBONY SV220 H+O 7nm + 3nm 2'' Dual-Band Filter Set + M42-M48 Filter Drawer. Condition: New, Made in China. Listed at 469.99 USD. SVBONY Narrowband Filter Quick Selection Guide. SV220 H+O 3nm H-Alpha(656.3nm) + OIII(500.7nm) 3nm. SV220 H+O 7nm H-Alpha(656.3nm) + OIII(500.7nm) 7nm. SV220 S+O 7nm SII(672nm) + OIII(500.7nm) 7nm. We have established a strict system to ensure product quality in a responsible manner.
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