Lens hoods are primarily designed to help protect the lens from impact shock and dust as well as prevent unwanted stray light from entering the lens by extending and shading the end of the lens. With its matte black interior, the lens hood is designed to reduce glare for cleaner, clearer pictures and the professional, sleek design adds a classy edge to this useful tool. Dedicated lens hoods are designed to match the specific focal length of the lens it was designed for.