Canon et 83c lens hood for ef100 400mm f45 56l usm is
Canon et 83c for ef100 400mm f45 56l usm is 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