This dedicated lens hood is designed for Canon EF-S 10-18mm f/4. 5-5. 6 IS STM Lens. Replaces CANON EW-73C lens hood. Features: Prevent unwanted stray light from entering the lens by extending and shading the end of the lens. Non-glare matte finish on the interior surface to further prevent or limit lens flare. This hood is also reversible to stay on lens when not in use. Now the original CANON lens cap can be attached to the lens normally.