Ultra-violet ray， although invisible to the human eye， gives bluish mist in color photography. UV filter eliminates ultra-violet ray effectively. No exposure compensation is necessary. Can be used at all times for protection or camera lens.                                    Features                Ultimate Thin Frame: Ultra thin low prlfile frames to help avoid vignetting on super wide angle lenses<br>    Multi-Resistant Coating: MRC is an extraordinarily effective multiple layer coating， it is also harder than glass， so that it protects filters from scratches and it is also water and dirt repellent， thus facilitating filter maintenance<br>    Screw-in Pressure Ring: The protector can be great tightness<br>    With the influence from UV light， the outdoor photos look hazy<br>    Suitable for both black and color films under bright sunshine<br>    It is a good protector for camear lens<br>    It could be used to limit UV light<br>    It is multi-resistant coating， waterproof， ultra thin frame digital professional filter<br>                                                            Specifications                        Dimensions     2.91 x 0.20 inch / 7.4 x 0.5 cm (Diameter x Thickness)    <br>          Package Size     4.37 x 3.82 x 0.55 inch / 11.1 x 9.7 x 1.4 cm (L x W x H)    <br>          Material     MRC    <br>          Color     Black Frame    <br>          Weitht     2.15 g / 61 g    <br>          External diameter     74mm    <br>          Internal diameter     72mm    <br>                                                             Package Includes                1 x 72mm MRC UV(W) Multi-Resistant Coating Waterproof Ultra Thin Frame Digital Professional Filter<br>