App Shopper: The Users’ Practical Guide to Canon EF Lens Mount (Photography)

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Mar 07 '12	Version 1.1.0
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The Users’ Practical Guide to Canon EF Lens Mount

iOS Universal

This app is a practical guide to Canon’s EF lens series.
Introduced in 1987, 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.
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.