1971–1990 · Flange 42 mm

Canon FD lenses

Canon launched FD in March 1971 with the F-1, replacing the FL mount, and used it on every manual-focus Canon SLR until EOS arrived in 1987. The last FD body, the T60, came in 1990. Original FD lenses lock on with a silver breech-lock ring that turns while the lens stays still. New FD lenses twist on as a whole, like any bayonet, and fit the same bodies. The 42mm flange is short for an SLR, which is why FD lenses can't focus to infinity on Canon's EF cameras without corrective glass.