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 5895-01-332-6716
NSN 5855-01-175-2465
NSN 6685-01-141-0386
NSN 5960-01-389-0629
NSN 4140-01-589-2215
NSN 6320-01-578-6006
NSN 6150-01-471-3811
NSN 6220-01-067-1442
NSN 5990-01-050-7535
NSN 5855-01-400-1590
NSN 6135-01-010-0891
NSN 6135-00-078-9931