Canon 2647A002 EW63II Lens Hood for EF 28 f/1.8, 28-105 f/3.5-4.5 & 28-105 f/4.0-5.6 SLR Lens
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. Almost all EF and TS-E lenses have a Canon lens hood engineered specifically for it.