The legendary Carl Zeiss Jena 75mm Biotar only featured in one of Carl Zeiss Jena's catalogues, the 1957 edition. Here is the best translation of the German text I can come up with. If a native speaker can give me a better translation I would appreciate it.
Six-lens - Image angle 32 ° - Adjustable from ∞ up to 0.8m
With aperture code
For small-format reflex cameras (except Exa)
Lens with medium focal length and
Extremely strong for ???? and
variety recordings as well as reportage
poor lighting and for portraits