180mm · f/2.8
The Isco-Gottingen Tele-Iscaron 180mm f/2.8 is a telephoto prime for Exakta mount. Optically, it shows fewer aberrations and less glow than the Zeiss Jena 180/2.8, but falls behind modern lenses like the Minolta 200/2.8 APO. Build quality includes a large number of aperture blades for smooth bokeh, but ergonomics are poor: the front group and aperture ring rotate during focusing, and adapting requires a custom Exakta mount. It suits users who prioritize optical character over handling convenience.