Overview

The Canon FDn 135mm f/3.5 is a lightweight, affordable telephoto lens with solid all-metal build and a practical built-in hood. Optically, it is sharp from f/5.6 to f/16, with low vignetting and chromatic aberration. Weaknesses include modest bokeh with abrupt disc edges and contrast drop in out-of-focus areas, and a maximum aperture of f/3.5 limits low-light use. The aperture ring has a long throw between f/32 and the A setting. It suits budget-conscious photographers needing a compact, sharp short telephoto for daylight portraits, travel, or architecture.