lens plate for Canon "B" collar lenses CP 10 Short plate for various "B" collar lenses. ARCA compatible foot for the many Canon lenses using the "B" collar including: EF 70-200 f/2.8L IS USM, EF 70-200 f/2.8L USM, EF 70-200 f/4.0 L USM, EF 180 f/4.5 Macro USM, EF 100 f/2.8 Macro USM with optional collar, and others. This is the shortest of the three (CP-10, CP-15, CP-20) ?B? collar feet and is recommended for lighter lenses. Securely mounts to the lens with our superior internal rib system. Mounting screw and wrench provided. Length 2.5? Weight: .7 ozs.