It is fully coupled to shutter speed dial and aperture ring on FD lenses in the match needle style.

Cannot be selected with an FD lens attached.

When this camera appeared, a new range of FD lenses was introduced, featuring instant mounting/unmounting of the lens.

(The three AC series lenses, extended from the FD lens mount, described below, are an exception).

On these early FD lenses, the breech ring can be rotated freely without mounting it on a camera body.

On this latest FD lenses the breech ring is latched in the mounting position until pressed to the camera.

An enhanced range of FD lenses were available to photographers who required the highest optical and mechanical performance.

They are not properly FD lenses, but are listed here because they are part of the whole system.

FD lenses can be mounted on most other period cameras with the appropriate Canon adapter and still retain infinity focus.

The original generation of FD lenses featured a silver coloured locking ring at the base.