Canon 50mm F/1.8 Breech Lock FL Mount Lens Review

The Canon 50mm F/1.8 Breech Lock FL is a vintage manual focus lens from Canon's FL series, which predates the modern FD and EF mounts. This used bargain-grade example comes from KEH at a modest $22, reflecting both its age and condition. The breech-lock mounting system, used briefly by Canon in the late 1960s and early 1970s, requires a twist-and-lock motion rather than the bayonet mount familiar to modern shooters.

As a legacy optic, this lens will not mount natively on current Canon EOS bodies without an adapter, and even then you'll lose electronic communication and infinity focus may be compromised depending on the adapter. It's best suited for adapted use on mirrorless cameras with shorter flange distances, where manual focus peaking and focus magnification can help compensate for the all-manual operation. At bargain grade from KEH, expect cosmetic wear and possibly some optical imperfections, though it may still deliver the character and rendering of classic glass for experimental or artistic shooting.