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I am going a different way. I have a QHY OAG coming to put on to my SVX80, which also has an M48 thread on the end of the flattener. That was 55mm backfocus as well but the actual lenses are quite a bit further up the tube than that 55mm, so I had them machine it to add a couple of mm of backfocus to the whole assembly. At the moment I will be using the QHY supplied M54 plate with an M54 to M48 step ring.
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