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 5910-00-209-6243
NSN 5935-01-481-3378
NSN 5910-00-175-7549
NSN 6220-01-565-1781
NSN 5905-01-259-4767
NSN 5960-00-835-3928
NSN 5910-01-159-7589
NSN 5930-00-880-2754
NSN 5998-01-632-5115
NSN 5935-01-146-4851
NSN 5960-01-064-0319
NSN 5998-00-890-0321