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I have made a few adaptors to make telescopes(?) out of camera lenses but I don't know of comercially available adaptors. I have turned them up on the lathe to mainly fit the zenit screw thread.
A few years ago there were a few Russian made 1000mm Mak telephoto lenses around that could be made into reasonable telescopes but they could not be brought into focus with a diagonal fitted. I made a special diagonal that just worked
Barry
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