Canon EW-78D Lens Hood for EF Lens Replacement for Canon EW-78D Lens Hood Compatible with Canon EF 28-200mm f/3.5-5.6 Lens &amp; EF-S 18-200mm F3.5-5.6 IS Lens Prevent unwanted stray light from entering the lens. Using non reflective paint for interior of lens hood. Designed to match the specific focal length of the lens.