The genuine Canon EW-78D Lens Hood is specifically designed for the EF 28-200mm f/3.5-5.6 and EF-S 18-200mm f/3.5-5.6 IS lenses to prevent unwanted stray light from entering the lens. This lens hood provides multiple functions:
- it shades the lens from straylight, improving your contrast and image quality
- in inclement weather, it can assist in keeping moisture or wind-blown debris off the lens
- it protects the front barrel from the inevitable impacts against walls,door frames, and other real-life obstacles.