ALFCHAHSU2

FCHALHSU-2

Alpine Astronomical

This 2" eyepiece Baader 3.5nm f/2.0 Ultra-Highspeed H-Alpha 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 planoptically polished, and has Life-Coat sealed edges. It is equally suitable for modern CMOS sensors as well as for older CCD camera technologies.None 4nm 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