Contax 135mm f/4 Sonnar for Contax rangefinder cameras
Manufactured in 1951, this Carl Zeiss 135mm f/4 Sonnar was produced for the Contax IIa and IIIa rangefinder cameras. With a lens adapter for the external bayonet, the lens becomes usable on a Micro Four Thirds digital camera.
The 135mm f/4 Carl Zeiss Sonnar has a focusing helical in the lens and mounts on the outer bayonet.
The inner bayonet mount is used for the 50mm Sonnar which does not have a built in helical.
Jupiter 9: A Soviet copy of the Contax 85mm f/2 Sonnar
Anyone familiar with the early Contax rangefinder cameras knows about the Soviet copies sold as Kiev cameras. The lenses are inexpensive and depending upon whom you ask, they are either decent or terrible. Those who rate the cameras and lenses as terrible blame it on poor quality control. The video above was made with this lens’ aperture set at f/2.8.
This particular lens is beautifully finished and operates smoothly for a 54 year old lens.
Jupiter 12: A Soviet copy of the Contax pre-war Carl Zeiss 35mm f/2.8 Biogon
The Jupiter 12 in Contax rangefinder mount is another lens that mounts on the outer bayonet and does not require the focusing helical in the Contax body. An extension tube between the adapter and the MFT camera body is necessary due to the protruding rear element of the Jupiter 12. The lens then becomes functional only as a macro lens equivalent to a 70mm lens on a full frame sensor camera.