ALFCSN2

FCSETN-2

Alpine Astronomical

The 2" Baader 6.5nm Narrowband Filter Set from Alpine Astronomical features three precision-grade filters designed for f/10 to f/3.5 optical systems. The set includes H-alpha, O-III, and S-II filters optimized for CMOS sensor cameras and also suitable for CCD sensors.None H-alpha, O-III, and S-II narrowband filter setNone 6.5 nm FWHM recommended for optical systems from f/10 to f/3.5None Designed to allow for 1:1:1 exposures, matched for typical CMOS quantum efficiency and s/n ratioNone Reflex-Blocker hard coated and planoptically polished with sealed coating edges (Life-Coat)None Blackened edges all around, with filter-lead-side-indicator in the form of a black frontside outer rimNone Optimized for CMOS cameras and suitable for CCD camerasNone Increased contrastNone Narrow passbands