Canon EF lens mount

The EF lens mount is the standard lens mount on the Canon EOS family of SLR film and digital cameras. EF stands for "Electro-Focus": automatic focusing on EF lenses is handled by a dedicated electric motor built into the lens. Mechanically, it is a bayonet-style mount, and all communication between camera and lens takes place through electrical contacts; there are no mechanical levers or plungers. The mount was first introduced in 1987.

Not to be confused with Canon EF camera.

Canon EF mount
The electronic contacts (gold-plated) of an EF mount lens.
Typebayonet
Inner diameter54 mm
Flange44 mm

Canon claims to have produced its 100-millionth EF-series interchangeable lens on April 22, 2014.

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