Overview

The aus Jena 135mm f/3.5 (Carl Zeiss Jena Sonnar) is a compact, all-metal vintage lens praised for its sharpness with a non-clinical rendering and smooth bokeh that avoids harsh polygons despite six aperture blades. It focuses down to under 1m, closer than many 135mm lenses, and is lightweight for its focal length. Weaknesses include potential flare issues in non-multi-coated versions and fully manual operation. It suits portrait and close-up photographers seeking a characterful, affordable telephoto, especially those using adaptable M42 mount systems.