Canon EF lens mount

Not to be confused with Canon EF camera.

Canon EF mount
The electronic contacts (gold-plated) of an EF mount lens.
TypeBayonet
External diameter65 mm
Inner diameter54 mm
Flange44 mm
Connectors8 electrical pins
IntroducedMarch 1987 (1987-03)
ReplacedCanon FD 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, with its last new lens design produced on Sep 5th, 2018.

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

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