Canon EW83J Lens Hood for EF17-55mm f2.8 IS USM

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