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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.
Some cameras with Canon EF mount are:
Full frame cameras with 35mm sensor:
Canon EOS-1Ds
Canon EOS-1Ds Mark II
Canon EOS-1Ds Mark III
Canon EOS-1D X
Canon EOS-1D C
Canon EOS-1D X Mark II
Canon EOS-1D X Mark III
Canon EOS 5D
Canon EOS 5D Mark II
Canon EOS 5D Mark III
Canon EOS 5D Mark IV
Canon EOS 5Ds
Canon EOS 5Ds R
Canon EOS 6D
Canon EOS 6D Mark II
Cameras with APS-H sensor (1.3x crop factor):
Canon EOS-1D
Canon EOS-1D Mark II
Canon EOS-1D Mark II N
Canon EOS-1D Mark III
Canon EOS-1D Mark IV
Cameras with APS-C sensor (1.6x crop factor):
Canon EOS D30
Canon EOS D60
Canon EOS 10D