Carl Zeiss Jena's portrait prime for Exakta — the 80mm f/2.8 Biometar with classic rendering.
The Carl Zeiss Jena Biometar 80mm f/2.8 (the 'Biometer' name in the canonical designation likely refers to the Biometar) is a medium telephoto lens from Carl Zeiss Jena designed for the Exakta SLR system. The Biometar formula was used across multiple Zeiss Jena medium-telephoto lenses of the 1960s–1970s.
The lens delivers 80mm at f/2.8 maximum aperture with Carl Zeiss Jena optical quality, Exakta bayonet coupling, manual focus, manual aperture, and the Biometar optical formula. The 80mm focal length provides a moderate telephoto perspective suited to portrait and general photography.
The 80mm at f/2.8 occupies a natural portrait focal length with useful subject isolation at wide aperture. Carl Zeiss Jena glass in Exakta mount is adaptable to modern mirrorless cameras and offers vintage Zeiss rendering at accessible prices compared to West German Zeiss equivalents.
Inspect Zeiss T-coating condition. Test aperture operation and focus ring smoothness. Verify Exakta bayonet coupling. The Biometar rendering at f/2.8 has a characteristically smooth quality valued by portrait photographers using vintage glass.