RainbowImaging Lens Hoods for Alpha 18-55mm f/3.5-5.6 lens replaces ALCSH108 Compatible with Sony Alpha DT 18-55mm f/3.5-5.6 lens, Replace Sony Lens Hood ALCSH108 A lens hood shades the lens from stray light, improving your contrast and image quality. 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.