The JJC LH-SH152 Bayonet Lens Hood It helps prevent unwanted stray light from entering the lens by extending and shading the end of the lens. It is crafted from ABS plastic material and features a non-glare matte finish on the interior surface to limit lens flare further. The hood allows you to put on a Ф77mm filter or lens cap. In addition, since the end of the lens is extended, you also get the added benefit of extra protection from accidental impact.