ALFCHALHS2

FCHALHS-2

Alpine Astronomical

This 2" eyepiece 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. 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.None 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