Highway 61
Revisited
(can't recall if Jena put out any 50mm lenses after the war, someone will know)
Yes they did. They released about 600 items of the Carl Zeiss Jena Sonnar 5cm f/1.5 T in aluminum or chrome plated brass barrels (or a mix of the two materials) and a tad more of CZJ Sonnar 5cm f/2 T in aluminum or brass barrels too. Those postwar Jena Sonnars are recognizable thanks to a specific lettering shape on their namerings and a very short black nose. They also use red copper for their internal barrels parts. They are absolutely excellent lenses. The aluminum made 5cm f/2 T is extremely light. Their aperture blades had a matte textured dark grey surface instead of the blueished steel used later on the Oberkochen lenses. The aluminum barrels made lenses have a quite thicker bayonet locking tab when compared with the chrome plated brass barrels made lenses.
They were made to be mounted on the so-called "Jena" Contax II bodies made in Saalfeld in 1946-1947 as well on the very first Kievs. But they are easy to find as a kit with the earliest Contax IIa cameras. When the first Contax IIa were released in 1949-1951 the Oberkochen plant wasn't running yet so the Stuttgart made cameras were sold with those Jena made Sonnars T for some time.