An item having two plane-parallel surfaces and used in the telescopic system of an optical instrument to modify the density or spectral intensity of light by absorption. Several filters having varied characteristics are usually mounted in such a manner that any selected filter may be moved in or out of the optical axis as light conditions warrant. Excludes window, optical instrument.
Classification: Military equipments not identified by kind
NSN 5975-00-541-8531
NSN 6650-00-191-9000
NSN 6150-00-412-1908
NSN 6650-01-600-4843
NSN 7035-01-169-6551
NSN 6135-01-411-3212
NSN 6150-00-222-5302
NSN 5935-00-675-5345
NSN 5950-00-709-9339
NSN 6645-01-228-2127
NSN 6240-01-495-3184
NSN 5835-01-116-2369