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 5999-01-068-6225
NSN 5998-00-837-4305
NSN 5960-00-728-3170
NSN 5855-01-085-1609
NSN 5998-00-408-8846
NSN 6130-01-407-1554
NSN 5930-01-412-3835
NSN 6685-00-740-7256
NSN 6240-01-027-7533
NSN 5855-01-643-2514
NSN 5965-01-537-7731
NSN 5925-01-586-9827