HOYA, the world renowned optical glass manufacturer, presents an innovative new range of (HD) UV filters featuring hardened optical glass that has 4 times the breaking strength in ANSI standardized testing - (ANSI Z80.3 : 2001) where steel balls of varying size and weight are dropped from a height of 50 inches onto the glass. They also boast specialised coatings that are not just waterproof and repel water spots but also hardened to be scratch and stain resistant. Of course these coatings are from HOYA so they greatly reduce reflections off the surface of the glass allowing you to capture more light in your photos.