H-alpha transmission filter, 12 nm wide, 2 "cast. FWHM 12 nm is the right proposition for astrophotographers working with DS astronomical cameras, and people who due to living in city, they have to filter the background strongly, leaving only a narrow band of h-alpha (this is the so-called narrow band photography).

(measurements on the Varian Cary 100 spectrophotometer, July 2015)


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