Some collared, telephoto lenses have a foot that can be removed. 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.
• 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