Opteka ET-67 Lens Hood for the Canon EF 100mm f/2.8 Macro USM Lens Replacement for Canon ET-67 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