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    Canon EOS (EF) adapters

    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.

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    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