This foot replaces the Canon lens collar foot on the Canon 500mm/f4 IS lens. 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-50 to completely remove the four Canon mounting screws.
- To install the LCF-50, use the four original Canon M3 screws and secure the Really Right Stuff foot to the lens collar.
- If your mounting screws loosen over time, consider using a drop of LocTite 242 for better security.

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Long Lens Packages to stabilize your telephoto lenses and improve your shots. And don't believe just us;
read this article by Thom Hogan.
Why Choose a Replacement Foot Instead of a Lens Plate?
A replacement foot with built-in dovetail mounting will be lighter, lower in profile, and provide the best possible stability for your lens.
- Length: 6.0 inches / 52mm
- Height: 1.3 inches / 33mm
- Weight: 5.8 ounces / 166g
- Bottom of foot has two accessory sockets: one ¼"-20 socket and one 3/8"-16 socket (both centered).
- This replacement foot allows lens hood to stow over the foot for storage.
- Price: $100