Switch your lens' original foot for a better-balanced design with the Lens Foot LC-60 for Select Canon Lenses from Markins that is made for the Canon EF 400mm f/2.8L IS II USM, EF 500mm f/4L IS II USM, EF 600mm f/4L IS II USM, and EF 800mm f/5.6L IS USM Lenses. The foot is constructed from Duralumin and hard anodized for a scratch-resistant surface. Dovetails on the bottom of the foot make it compatible with Arca-type heads or clamps, and 1/4"-20 and 3/8"-16 sockets under the foot can be used to mount directly on a monopod or tripod if no quick release system is present.