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 5960-01-543-0235
NSN 6135-01-056-4609
NSN 6645-00-833-2395
NSN 6105-01-439-4438
NSN 6220-01-136-2765
NSN 6610-00-284-3093
NSN 6685-01-003-5885
NSN 6220-00-814-8548
NSN 5905-01-010-8892
NSN 7035-01-158-7673
NSN 6645-00-596-5388
NSN 6145-01-268-3816