Zeiss Jena 2.5/25cm Sonnar V2 for 8 x10 inch. Yellow coating ca. 1946. UNIQUE LENS
An impressive, very fast large format lens, covering 8x10", with a maximal aperture of f:2.5. The lens is an extremely rare prototype, made using thorium glass element (with a typical slight yellow tint). It is in beautiful condition, with very good optics.
Thiele lists only 5 of these prototype lenses, with the offered example being the first one produced
