Developed to exceed the sharpness needs of 50 megapixel cameras entering the market, the Hoya HD3 UV (Ultraviolet) camera filter has a new and improved 32-layer ultra-soft, ultra-hard, nano-coating that is 5x sharper and 800% harder than Hoya HD2 UV. Combined with Hoya's exclusive chemically enhanced optical UV glass that is 4 times harder than traditional optical glass, the new Hoya HD3UV protects your lens from blowing sand, freezing temperatures, and rain showers, making it the new "hottest filter." of the planet".