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Author Message   Rick_oleson Tinkerer Username: Rick_oleson Post Number: 1134 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Monday, May 16, 2011 - 08:41 pm:    I've never heard of that, but I have heard of some Kiev bayonet lenses fitting some bodies better than others, so I guess you could have the same tolerance mismatch issue with the screw thread. You can lap the threads in and make them fit by putting some silver polish (Simichrome, etc) on the threads and working them in: screw the lens in until it binds, back it off, go a little farther next time, and gradually the abrasive will remove a little metal from the threads until the will fit together. It's an extreme case, but I've made 1mm pitch threads fit into a .75mm pitch mount this way. If I can do that, surely you can make your Industar fit your Zorki.