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. Compatible with:. Canon EF 85mm f/1.8. Canon EF 100mm f/2.0,. Canon EF 135mm f/2.8L. Canon EF 100-400mm f/4.5-5.6. 12 Month Return to Base Warranty
