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  • Canon EF 100-400mm f/4.5-5.6L IS II USM Lens Foot | LCF-54

Canon EF 100-400mm f/4.5-5.6L IS II USM Lens Foot | LCF-54



Foot for Canon EF 100-400mm f/4.5-5.6L IS II USM


Some collared, telephoto lenses have a foot that can be removed. If your lens has this option, choose one of our foot replacements 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. Really Right Stuff foot replacements are precision machined from solid blocks of 6061-T6 aluminum and are fully compatible with 1.5" RRS Dovetail Standard. This foot replaces the Canon foot on the Canon 100-400mm f/4.5-5.6L IS II USM lens.

Note: We are not aware of any camera or tele converter that will not balance properly with this foot. In some cases you will have to make full use of the dovetail to move the camera/lens forward in the clamp. Please contact us if you have any specific questions.

1. To remove the Canon foot, loosen the built-in thumb screw by pulling the thumb wheel closer to the lens, and then loosening in a counter-clockwise direction.

2. To install the LCF-54, use the included 5/32" hex key to tighten the custom M5 mounting screw and secure the RRS foot to the lens collar.

3. If your mounting screw loosens over time, consider using a drop of medium threadlocker, such as Vibratite or Loctite 242 for better security. Use one of our Long Lens Support Packages to stabilize your telephoto lenses and improve your shots.

Note: Attached to the lens there is a small black sub-plate. The sub-plate is mounted to the lens using four small screws and the LCF-54 is mounted to the sub-plate using a custom M5 threaded captive style mounting screw. The interaction between the LCF-54 and the Canon sub-plate is absolutely solid but there is potential for wobble between the Canon lens and the Canon sub-plate. The LCF-54 mitigates the movement by captivating the sub-plate, but some movement may still exist between the Canon lens and the Canon sub-plate. To alleviate the movement further, ensure the sub-plate is securely fastened to the lens via the four small screws. The screws require a 00 JIS bit to be fastened. The bit is included with our MTX® Multi-Tool.”

Note: The LCF-54 is not compatible with the Canon C100 Mk II and other camera bodies that have a protruding platform on the front of the camera body. 


• CNC machined 6061-T6 aluminum
• Anodized; Type II Black
• 1/4"-20 threaded accessory mounting socket
• Added foot height allows for comfortable grip when transporting
• Strap boss
• Integrated QD (Quick Detach) socket


  1. Length: 4"/ 102mm
  2. Width: 1.7"/ 43mm
  3. Height: 1.5"/ 38mm
  4. Weight: 2.7oz/ 76g

In the Box

  1. (1) Canon EF 100-400mm f/4.5-5.6L IS II USM lens foot
  2. (2) M3 safety-stop screw
  3. (1) M2.5 hex key
  4. (1) 5/32" hex key
  5. (1) Custom M5 threaded captive style mounting screw
  6. (1) User's guide