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 5996-00-725-2701
NSN 6610-01-151-7669
NSN 5935-01-113-2773
NSN 6645-01-499-4798
NSN 6645-00-850-6486
NSN 6620-00-847-6385
NSN 5975-01-295-5769
NSN 6685-00-464-2773
NSN 5985-01-288-7595
NSN 2925-00-373-8837
NSN 6105-00-285-2774
NSN 6240-00-372-4841