Above, a 1951 Leica IIc 450001-451000 (Batch 1000) body sporting a light meter and a 1952 Ernst Leitz Wetzlar Summaron f=3.5cm 1:3.5. The IIIc (3C) had a max B-1000 shutter speed, the IIc (2C) only 500.
70 year-old lenses and image samples
Below, the same lens on the Canon R5 using a Novoflex screw-mount M39 adaptor. This adaptor works beautifully.