Overview

The Brenner 135mm f/2.8 Auto is a lightweight (350g) M42-mount telephoto lens from the 1970s, likely a Japanese design sold by a German dealer. Optically, it delivers acceptable center sharpness but lacks contrast and punch, with significant purple fringing at f/2.8 that diminishes by f/4. Bokeh is fine, but flare resistance is poor. Build quality feels plasticky. It suits users seeking a compact, inexpensive 135mm lens for crop sensors, where corner sharpness improves, but not for demanding work.