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Author Message   Glenn Tinkerer Username: Glenn Post Number: 355 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Thursday, May 22, 2008 - 06:50 pm:    Steve, Yes the LTM is Whitworth thread form. I agree that the Russian threads can be very badly formed and difficult to check with gauges. What is noticeable on all my Russian lenses is that the lens thread is a very sloppy fit - diameter wise - in the body female thread until nipped up. I have four Zorki 1 bodies which are mated to various modern wide angle lenses. They travel everywhere with me and are less of a worry than taking my Leicas. The Zorkis have proved to be utterly reliable despite some hard use, and they are very easy to CLA.