JJC LH-HA011 Lens Hood features a filter access window for easier adjustment of specialty rotating filters such as ND and CPL filters while the hood is in place. The hood prevents unwanted stray light from entering the lens by extending and shading the end of the lens. It has a non-glare matte finish on the inside to further prevent or limit lens flare. There is no vignetting with the hood on. It can also be placed backwards over the lens for a more compact storage solution. The hood allows you to put on a lens cap, too. In addition, since the end of the lens is extended, you also get the added benefit of some extra protection from accidental impact. JJC LH-HA011 lens hood replaces Tamron HA011.