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 5998-00-058-7816
NSN 6110-01-082-2409
NSN 5996-01-601-0012
NSN 6220-01-542-8738
NSN 4140-00-975-5070
NSN 5905-01-090-3952
NSN 5965-01-632-5954
NSN 5835-01-315-9948
NSN 6220-01-258-6217
NSN 5990-01-463-2279
NSN 5920-01-392-8908
NSN 2925-01-156-9570