Opteka ET-65III Lens Hood for the Canon EF 85mm f/1.8 USM, 100mm f/2, SF EF 135mm f/2.8 & 100-300mm f/4.5-5.6 Lenses Replacement for Canon ET-65III Lens Hood Compatible with the Canon EF 16-35mm f/2.8L, EF 17-35mm f/2.8L, & EF 17-40mm f/4L Lenses Prevent unwanted stray light from entering the lens Extra protection from accidental impact Designed to match the specific focal length of the lens