LENSES BY FITTING
Focusing is driven by a "Silent Wave" motor in the lens instead of the focus drive motor in the camera. AF-S lenses focus faster than standard AF-Nikkors and almost completely silently.
These lenses are not suitable for Full Size FX Digital Cameras or 35mm Film Cameras.
The Canon EF-S mount only fits digital SLRs with cropped sensors. The S stands for short back focus and means it's compatible with SLRs featuring smaller mirror boxes.
The Canon EF mount is compatible with both full-frame and cropped sensor digital SLRs.