Baader Planetarium H-alpha Ultra-Narrowband-Filter (3.5nm) – CMOS-optimized
Key specifications
| Filter type | Narrowband |
|---|---|
| Passband | H-alpha |
| Bandwidth | 3.5 nm |
About
A CMOS-optimized 3.5 nm FWHM H-alpha ultra-narrowband filter for systems slower than f/3.4, aimed at heavily light-polluted skies and matched to the O-III / S-II filters' exposure times, with Reflex-Blocker hard coatings and blackened edges.