Baader Planetarium O-III Ultra-Narrowband-Filter (4nm) – CMOS-optimized
Key specifications
| Filter type | Narrowband |
|---|---|
| Passband | O-III |
| Bandwidth | 4 nm |
About
A CMOS-optimized 4 nm FWHM O-III ultra-narrowband filter (Premium Grade) for systems slower than f/3.4, aimed at heavily light-polluted skies, with Reflex-Blocker hard coatings, sealed coating edges and blackened edges.