Opteka EW-78BII Lens Hood for Canon EF 28-135mm f/3.5-5.6 IS SLR Lens Replacement for Canon EW-78BII Lens Hood Compatible with the Canon EF 16-35mm f/2.8L, EF 17-35mm f/2.8L, & EF 17-40mm f/4L Lenses1 Prevent unwanted stray light from entering the lens Extra protection from accidental impact Designed to match the specific focal length of the lens