Petal Shape Dedicated Lens Hood - Designed to match intended specific focal length of the lens Made For Wide Angle Zoom Lens Compatible with Canon 16-35mm, 20-35mm, 17-35mm, 17-40mm & 10-22mm Lenses EW-83E It shades the lens from stray light, improving your contrast and image quality Protects the front barrel from the inevitable impacts against walls, door frames, and other real-life obstacles