This lens hood maximizes the amount of hood coverage for the minimum amount of weight and hood area because of its "petal" shape.This dedicated camera lens hood is specifically designed to match the exact focal length of the lens it was designed for. Improve the image quality and contrast of your photographs with this camera lens hood which covers different focal lengths and provides the solution to the problems caused by sun glare, rain and wind-blown debris. The screw hood is also valuable in providing protection against knocks and damage and is an essential piece of kit for any photographer.In addition, sine the end of the lens is extended, you also get the added benefit of some extra protection from accidental impact.