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 5895-00-328-8351
NSN 5975-00-226-8429
NSN 6240-00-145-8167
NSN 6145-00-010-5135
NSN 5925-00-905-5135
NSN 5950-01-099-4664
NSN 6620-00-774-3638
NSN 6650-00-202-4540
NSN 5910-01-446-3996
NSN 5999-00-932-2509
NSN 6135-00-016-0071
NSN 5965-00-236-0016