HeavyStar Dedicated Lens Hood for Canon EF 70-300mm f/4-5.6 IS USM & EF 70-300mm f/4-5.6 DO IS USM Lenses As ET-65B
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.