Prevent unwanted stray light from entering your Sigma 18-50mm f/2.8 Digital EX lens with this dedicated Lens Hood from Sigma, which is manufactured to match the design and optics of your valuable glass. This hood features a non-glare matte finish on the interior surface to further prevent or limit lens flare. Additionally, because the hood extends out from the front lens element, you get extra protection from accidental impact and the elements.