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 5 times stronger sharp and 800% harder than the 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 driving rain, living up to being the new "toughest filter in the world." planet".