Overview

The Canon FL 100mm f/3.5 is a compact, lightweight telephoto lens praised for its sharpness and portability. Its Ernostar design delivers good detail resolution, though coating technology is dated. Build quality is solid, with a dual-ring aperture and 48mm filter thread. It requires stop-down metering on FD bodies but adapts well to mirrorless. Suited for location shots and portraits (Reddit/stevemark). A niche, well-regarded lens for those comfortable with manual operation.