Canon EF lens mount

The standard lens mount on the Canon EOS family of SLR film and digital cameras.

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.

In 2003, Canon introduced the EF-S lens mount, a derivative of the EF mount that is strictly for digital EOS cameras with APS-C sensors released after 2003. EF lenses can be mounted on EF-S bodies but EF-S lenses cannot be mounted on EF bodies. In October 2012, Canon introduced the EF-M lens mount, a derivative designed exclusively for mirrorless interchangeable-lens cameras (MILCs) with APS-C sensors. EF and EF-S lenses can be mounted on EF-M bodies via the optional Mount Adapter EF-EOS M.

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

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Canon EF lens mount
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Adapted from content published on wikipedia.org
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  • Image By Nebrot - Own work, CC BY-SA 3.0 — from wikimedia.org
Last modified on June 5, 2020, 7:36 pm (2 Months ago)
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