The Canon EF-S lens mount is a derivative of the EF lens mount created for some Canon digital single-lens reflex cameras with APS-C sized image sensors. It was released in 2003. Cameras with the EF-S
An example of a plastic EF-S lens mount.
An EF-S compatible body, the Canon EOS 400D, with open lens mount
An EF-S compatible mount close-up, from the Canon 30D. Note the circular indent inside the mount, which corresponds to the raised ring on the lens.
EF lens (left) and EF-S lens (right). Note raised ring on EF-S lens.
Advanced Photo System type-C is an image sensor format approximately equivalent in size to the Advanced Photo System film negative in its C format, of 25.1×16.7 mm, an aspect ratio of 3:2 and Ø 30.15
Canon EF-S lens mount
…The Canon EF-S lens mount is a derivative of the EF lens mount created for some Canon digital single-lens reflex cameras with APS-C sized image sensors. It was released in 2003. Cameras with the EF-S mount are backward compatible with the EF lenses and, as such, have a flange focal…
Canon EF-S lens is compatible with Canon's APS-C digital SLRs