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 5950-00-170-4153
NSN 6650-01-013-0667
NSN 5960-01-148-2297
NSN 6650-00-276-9838
NSN 6650-00-864-2942
NSN 6240-00-105-8380
NSN 5935-01-086-1196
NSN 5930-01-554-9405
NSN 6135-01-322-4655
NSN 6130-01-298-9913
NSN 6220-01-158-5956
NSN 5910-01-099-3157