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 6135-00-931-9049
NSN 6320-01-215-6459
NSN 5835-01-180-9441
NSN 5996-00-292-2624
NSN 7035-01-464-1213
NSN 7035-01-391-9858
NSN 6650-01-313-1300
NSN 5910-01-323-6922
NSN 6150-00-708-2965
NSN 6620-00-697-1398
NSN 5998-01-180-0549
NSN 5905-01-275-8696