Zomei Ultra Slim HD 18 Layer Super Multi-Coated SCHOTT Glass PRO MC-UV Ultra Violet Lens Filter - 52mm High quality Import German SCHOTT Optical glass, meet the Requirements of European Union's standards of Environment Protection-ROHS. Double sided 18 layers anti-radiation coating, 99.9% transmittance and very low reflectivity. Ultra slim frame design, about only 3.24mm thickness, avoid dark corner of wide angle lens. Protect lens from dust, oil, moisture, fingerprints and scratches. Provides basic reduction of ultraviolet light. Helps eliminate haze and bluish cast in images.