This foot replaces the Canon lens collar foot on the Canon 200mm/f2 lens. Unique design allows lens with pro-size camera body and 1.4x extender to perfectly balance. You can mount your lens in any Really Right Stuff clamp when this replacement foot is installed.
To remove the Canon foot, use the M2.5 hex key tool that comes with the LCF-41 to completely remove the four Canon mounting screws.
To install the LCF-41, use the four original Canon M3 screws and secure the Really Right Stuff foot to the lens collar.