Lens hoods are primarily designed to prevent unwanted stray light from entering the lens by extending and shading the end of the lens. In addition, since the end of the lens is extended, you also get the added benefit of some extra protection from accidental impact. Dedicated lens hoods are designed to match the specific focal length of the lens it was designed for.
Here at Campkins, it is our pledge to offer our customers great value and service. We might be small but that doesn't mean we cant always compete on price. If you find a cheaper product from one of our competitors, we will try to match or better our price if it means to retain your custom. Contact us for more information.