astro.n-minus

Filter

Baader Planetarium 3.5 / 4nm Ultra-Narrowband Filter-Set – CMOS-optimized (H-alpha / O-III / S-II)

Baader Planetarium · 3.5 / 4nm Ultra-Narrowband Filter-Set – CMOS-optimized (H-alpha / O-III / S-II) · narrowband telescope filter

Key specifications

Filter typeNarrowband
PassbandH-alpha / O-III / S-II

About

A set of three CMOS-optimized ultra-narrowband filters (3.5 nm H-alpha, 4 nm O-III and S-II) for systems slower than f/3.4 under heavily light-polluted skies, with Reflex-Blocker hard coatings, sealed coating edges and blackened edges.