This 47.4mm round Baader 6.5nm f/2.0 H-Alpha Highspeed CMOS Filter from Alpine Astronomical is recommended for extremely fast optical systems from f/3.4 to 1.8, and is designed for the special filter requirements of fast optics like Celestron RASA astrographs. This filter is unmounted for use in the Baader FCCT (Filter Changer Camera Tilter). The filter features a Reflex-Blocker hard coating, which has been planeoptically polished, and has Life-Coat sealed edges. It is equally suitable for use with modern CMOS sensors as for older CCD camera technologies.
- 6.5nm FWHM, recommended for extremely fast optical systems from f/3.4 to 1.8
- Specially designed for the special filter requirements when used with fast optics like the Celestron RASA astrographs
- Reflex-Blocker hard coated and planoptically polished with sealed coating edges (Life-Coat)
- Blackened edges all around, with filter-lead-side indicator in the form of a black frontside outer rim
- Optimized for modern CMOS cameras, but excellent for CCD camera technologies