Rodenstock Ysaron 50/3.5 [V4]

Single-coated Tessar enlarger lens. One Lanthanum element. [V4] (from 1970) has a (white) illuminated aperture window with a long indicator mark, and a curved five-blade aperture. Some late models also have a filter thread. Engravings on rear differ (‘MADE GERMANY’ or, later, tending toward ‘Lens Made in Germany’). AKA Rodenstock Omegaron 50/3.5. [Cat.08.050.01].