![]() ![]() ![]() On the back of these models there is a hole covered by a black plug, presumably for back focus calibration. It is found on early Leica Standards as well. This feature was first seen on late Leica I model C cameras in 1931, and all Leica II, Model D from 1932, identified by a '0' (zero) stamped on the lens mount flange at the top, to indicate the implementation of the standard, a practice that was continued for some time. All these models use the standardised lens mount with distance from film plane to lens flange fixed to 28.8 mm, a Leitz standard. The Leica III with lower shutter speeds was introduced in 1933 this model would later have the faster speed of 1/1000 sec with the IIIa of 1935, though the Leica III would continue in parallel production for several years. The camera began production in the same year as the Leica II with a coupled rangefinder. The Leica Standard was introduced as a basic model by Ernst Leitz, Wetzlar in October 1932. ![]()
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