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.

1. 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.
2. To install the LCF-50, use the four original Canon M3 screws and secure the Really Right Stuff foot to the lens collar.
3. If your mounting screws loosen over time, consider using a drop of LocTite 242 for better security.

Use one of our 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.

1. Length: 6.0 inches / 52mm
2. Height: 1.3 inches / 33mm
3. Weight: 5.8 ounces / 166g
4. Bottom of foot has two accessory sockets: one ¼"-20 socket and one 3/8"-16 socket (both centered).
5. This replacement foot allows lens hood to stow over the foot for storage.
6. Price: $100

Specs:

1. Length: 6.0 in / 152 mm
2. Height: 1.3 in / 33 mm
3. Weight: 5.8 oz / 164g
4. Bottom of foot incorporates two accessory sockets: one ¼"-20 and one 3/8"-16.
5. This item includes one LCF-50 replacement foot, one M2.5 hex key, and two M3 safety stop screws.

Flash Bracket:

Our B-Series & Flash Ring Brackets mount to the Really Right Stuff lens plate (or replacement foot) on your collared lens. The Canon EF 500mm/f4.0L-IS lens is compatible with our medium B87-QR or large B91-QR, but of the Flash Rings only FR-91 will fit over the front element.