One of the most important accessories for each lens you own. A lens hood provides
multiple functions: it shades the lens from stray light, improving your contrast
and image quality; in inclement weather, it can assist in keeping moisture or
wind-blown debris off the lens; and it protects the front barrel from the inevitable
impacts against walls, door frames, and other real-life obstacles. Almost all
EF and TS-E lenses have a Canon lens hood engineered specifically for it.