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Author Message   Michael_linn Tinkerer Username: Michael_linn Post Number: 4 Registered: 04-2011 Rating: N/A Votes: 0 Posted on Wednesday, May 04, 2011 - 11:10 pm:    Leo- I'm a bit puzzled. You stated that you could not remove the retaining ring but you have got the lens separated from the front standard? No, I do not know of any web site showing how to dismantle the lens. It is pretty standard for it's era like a compur or a copal. Can you put up some photos? I'm having a problem understanding your situation.