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, durable filter that is 5x Nano stronger sharp and 800% harder than Hoya HD2 UV. Combined with the exclusive chemically enhanced Hoya Optical UV glass lens that is 4x harder than the new Hoya HD3UV traditional optical glass protecting your filter from blowing sand, freezing temperatures and rain, life up to be the new "toughest" of the planet".