Carl Zeiss Jena Lenses
Auto Diaphragm Lenses

The top sketch shows the disassembly of the 58/2 Biotar with automatic diaphragm, in Exakta mount. The automatic Flektagon and Tessar lenses are similar in construction.

Preset Lenses

The sketches below are based on the 80mm f/2.8 Tessar in M42 Contax S mount, but the basic construction is typical of a number of Jena lenses of the early 1950s.

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