Overview

The Canon Serenar 135mm f/3.5 LTM is a lightweight, solidly built telephoto lens from the 1950s, but its awkward 135mm focal length limits its popularity on rangefinders. Optically, it is described as "almost completely free of aberrations" and recommended for aerial photography. However, its long-tube design looks comical on cameras. It suits users needing a compact, affordable telephoto for rangefinder or adapted digital use, though focusing challenges and niche appeal persist.