The EF-S lens mount is a derivative of the EF lens mount created for a subset of Canon digital single-lens reflex cameras with APS-C sized image sensors. It was released in 2003. Cameras supporting the EF-S mount are backward-compatible with the EF lens mount and, as such, have a flange focal distance of 44.0 mm. Cameras supporting EF-S, however, have more clearance, allowing lens elements to be closer to the sensor than in the EF mount. Only Canon cameras with the APS-C sized sensor released after 2003 support the EF-S mount.
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