Biotar 75/1.5 T (1:1.5 f=7.5cm) Carl Zeiss Jena Nr.3321321, крепление М42

This is a Biotar 75/1.5 T lens from 1950, known for its excellent light gathering ability and beautiful bokeh. It features red T markings, a smooth helicoid, and a single diaphragm control ring.

• The description claims this lens is one of three revisions, with the second being the sharpest.
• The description claims the lenses have air bubbles, which is characteristic of their manufacturing process at the time.