The precision design lens hood is primarily designed to prevent unwanted stray light from entering the lens by extending and shading the end of the lens. You can get the added benefit of some extra protection from accidental impact. The main function of the lens hood is to shade the lens from stray light， improving your contrast and image quality. But it will also protect the front barrel from the inevitable impacts against walls， door frames， and other real-life obstacles and in inclement weather. It can assist in keeping moisture or wind-blown debris off the lens.                                    Features            New and high quality<br>The Lens Hood is designed to prevent any unwanted stray light (and helps to minimize lens flare) from entering the lens by extending and shading the end of the lens<br>In addition， since the end of the lens is extended， you also get the added benefit of some extra protection from accidental impact<br>                                                            Specifications                        Dimensions          3.94 x 3.86 x 1.02 in (L x W x H)        <br>          Weight          1.31 oz        <br>          Color          Black        <br>                                                              Package Includes            1 x Camera Square Lens Hood for Cokin P Series Filter Holder<br>