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 6135-01-495-0933
NSN 6135-01-582-1283
NSN 5925-00-487-1502
NSN 5960-01-375-6815
NSN 5930-01-161-1709
NSN 6610-01-056-1335
NSN 5835-01-229-6964
NSN 5925-01-021-5365
NSN 5975-00-594-8857
NSN 5895-00-052-2752
NSN 6105-01-248-0609
NSN 6130-01-101-4048