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 5990-00-958-8344
NSN 5920-01-386-8116
NSN 5915-00-162-5942
NSN 6620-01-278-8028
NSN 2925-01-092-7335
NSN 5910-01-029-9548
NSN 6645-01-307-8203
NSN 4140-01-469-2266
NSN 6130-01-534-5488
NSN 5920-01-367-5791
NSN 7035-01-581-3869
NSN 6645-00-021-6408