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 6240-01-200-7937
NSN 5935-00-865-7723
NSN 6105-01-475-4115
NSN 5975-01-298-1549
NSN 5996-01-417-8669
NSN 5920-01-284-9038
NSN 5960-01-536-9763
NSN 5960-00-104-5955
NSN 6130-00-068-0237
NSN 6650-00-010-6481
NSN 5996-01-067-8303
NSN 6320-00-823-2015