CowboyStudio Lens Hood for Canon 70-300mm f/4.5-5.6 DO-IS USM, 70-300mm f/4-5.6 IS USM Lenses (replaces Canon ET-65B, ET-65 B)
Lens hoods are primarily designed to prevent unwanted stray light from entering the lens by extending and shading the end of the lens. In addition, since the end of the lens is extended, you also get the added benefit of some extra protection from accidental impact. Dedicated lens hoods are designed to match the specific focal length of the lens it was designed for. Compatible with the following Canon lenses: Canon EF 75-300mm f/4.0-5.6 USM Lenses; Canon EF 75-300mm f/4.0-5.6 II Lenses; Canon EF 75-300mm f/4.0-5.6 II USM Lenses; Canon EF 75-300mm f/4.0-5.6 III USM Lenses; Canon EF 75-300mm f/4.0-5.6 III Lenses; Canon EF-S 55-250mm IS Lens.