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Author Message   John_shriver Tinkerer Username: John_shriver Post Number: 64 Registered: 12-2006 Rating: N/A Votes: 0 Posted on Friday, January 21, 2011 - 07:54 pm:    The Topcon Topcor "N" lenses used by the Navy on the P-3 Orion "sub hunter" planes had an infinity lock, a latch that you could push and release.