Canon EW-83II Lens Hood

Canon EW-83II Lens Hood for EF 20-35mm f/3.5-4.5 Lens

Canon EW-83II Lens Hood : 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.