Leica Summaron 35mm1952 Ernst Leitz Wetzlar Summaron f=3.5cm 1:3.5 on a 1951 Leica IIc 450001-451000 (Batch 1000) body. The IIIc had a B-1000 shutter speed, the IIc only goes to 500.The first 35mm shot adapted to the R5 below (with ISO set at 500).