Overview

The Canon FL 19mm f/3.5 is an ultra-wide-angle lens (96°) introduced in 1964. Optical strengths include low distortion and flat field, though some copies may show slight bowing at edges. Weaknesses: early non-retrofocus versions require mirror lock-up and an external viewfinder. Build is solid, with a compact package, but filter compatibility is tricky (Series IX or 77mm). It suits vintage enthusiasts seeking a unique, characterful wide-angle for adapted mirrorless or film use, but the retrofocus 'R' version is more practical for SLRs.