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 5855-01-100-3272
NSN 6130-00-861-2589
NSN 6130-01-223-8274
NSN 5990-01-316-0989
NSN 5990-00-901-2574
NSN 6110-01-167-7939
NSN 5915-00-206-0086
NSN 5975-00-072-6075
NSN 5975-01-245-8641
NSN 5945-01-120-7588
NSN 5999-00-886-5691
NSN 5965-00-583-4865