 Canon FD 200 mm lens


The New FD range changed the method by which the lens locked to the lens mount; instead of the silver locking ring at the base rotating while the rest of the lens remained still, the whole lens barrel rotated to lock the lens, even though the actual mating surfaces of the breech-lock mount remained stationary in respect to each other.This made the lenses attach more like the bayonet-lock mounts of other brands, and did away with the criticism that Canon lenses were more slow and fiddly to mount.