This foot replaces the Canon lens collar foot on the following Canon lenses. You can mount your lens in any Really Right Stuff clamp when this replacement foot is installed. ò Canon EF 400mm f/2.8L-IS ò Canon EF 600mm f/4L-IS ò Canon EF 800mm f/5.6L-IS
To remove the Canon foot, use the M3 hex key tool that comes with the LCF-51 to completely remove the four Canon mounting screws.
To install the LCF-51, use the four original Canon screws and secure the Really Right Stuff foot to the lens collar.