Developed to exceed the sharpness needs of 50-megapixel cameras entering the market, the Hoya HD3 Uv (Ultraviolet) camera filter sports a new and improved 32-layer ultra-smooth, ultra-hard, nano-coating that is 5x sharper and 800% harder than the Hoya HD2 Uv. Combined with the exclusive chemically enhanced Hoya optical Uv glass which is 4x harder than traditional optical glass the new Hoya HD3UV protecting your lens from blowing sand, freezing temps and driving rain, living up to being the New ""Toughest Filter on the Planet""..