Canon EF lens mount

Common card · No. 215301

The EF lens mount is the standard lens mount on Canon’s EOS family of 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 electronic contacts, with no mechanical levers or plungers. The EF mount was first introduced in 1987, superseding the FD mount, and bridged Canon’s transition from film to digital camera bodies. Canon announced the production of its 100-millionth EF-series interchangeable lens on April 22, 2014. The last new EF lens design was released in 2018, with Canon’s focus shifting to their new RF lens system. EF lenses can be used via an adapter on RF camera bodies, but RF lenses cannot be used with EF cameras. EF has no interoperability with the FD mount system.

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