Overview

The Mamiya/Sekor 135mm f/2.8 Auto is a well-regarded vintage telephoto lens with all-metal build and smooth handling. Optically, it delivers excellent sharpness and contrast even wide open, though it exhibits a slightly curved focal plane causing soft corners at infinity and flare can be an issue. Bokeh is pleasant with a slight swirl effect. It suits portrait and detail photography on modern mirrorless via M42 adapter, but buyers should check for stuck aperture rings and infinity focus issues.