Lenses: Lens mount

All EOS cameras have an EF lens mount and accept all EF lenses. The EOS 20D and most later, non-professional models also accept EF-S lenses. These have been specifically designed for digital cameras.

The EF lens mount has a red alignment spot at the top. The EF-S mount also has the red spot, but additionally features a white alignment square to the right. Both mounts accept all EF lenses. The EF-S mount also accepts EF-S lenses.

EF-S lenses only cover the APS-C size sensor, not the larger 35mm frame. EF-S lenses will not fit other EOS cameras. Both EF and EF-S lenses autofocus.

The EOS system also includes TS-E lenses. These have tilt and shift movements. Tilting the lens alters the plane of depth of field, which can create some interesting focusing effects. Shift, which refers to the lens moving sideways, helps to control perspective, especially when photographing tall buildings.