![]() ![]() Like most Leicaphiles I’d always assumed, based on the words of experts and historians, that Leitz had originated the 39mm Leica screw mount, aka M39 or LTM, back in 1930, first installed it on the early Leica I (Model C) in non-standardized form, and then standardized it on later Model Cs by adopting a uniform flange focal distance of 28.8mm. ![]() That’s what everyone says, but one Italian expert begs to differ! Was the Leica screw mount really created by Leitz, Wetzlar?
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