Canon EW83E Lens Hood for EF16-35mm f2.8 L U EF17-40mm f4.0 L 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