The HD nano Mk II coatings are the hardest, most scratch and dirt-resistant coatings offered by any manufacturer. The HD nano Mk II UV filter is a filter with a UV blocking curve that does not affect the visible light spectrum. Additionally, this filter features a new active coating that protects the lens from abrasions while allowing for easy cleaning of water spots and fingerprints. The HD nano Mk II glass is a chemically enhanced optical glass that is 4 times stronger. The newly developed coating adheres more firmly and densely to the glass surface at the nano level than before. This results in extremely high-density particles being layered on the glass surface, leading to a hard and smooth coating.