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Author Message   Tom_cheshire Tinkerer Username: Tom_cheshire Post Number: 333 Registered: 04-2009 Rating: N/A Votes: 0 Posted on Friday, July 09, 2010 - 05:21 pm:    Oh, ok, thought you had the Tessar lens in that. The Tessar is f3.8 The Xenar and Trioplan are f3.5 Looking at your bigger pic. makes me have second thoughts about the shutter being the same as the Retinas. In any case, Compur shutters are common among old cameras so if you find a working one you can just swap shutters then transfer lenses and aperture scale.