Contax I (f) is the last model of the black contax I's begun in 1932.
Film advance and shutter speeds are both controlled by the large knob
on the front of the camera. The shutter is a vertically oriented
shutter similar in appearance to a venetian blind. The entire back is
removeable for easy film loading. The bayonet mounted lens is a Carl
Zeiss Jena Tessar f2.8 / 50mm. The last picture shows a single exposure
back for scientific or copy work.