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.
The Canon EF-S 17–85mm f/4–5.6 IS USM is a standard zoom lens for Canon digital single-lens reflex cameras with an EF-S lens mount and image stabilization. The EF-S designation means it can only be us