The HD nano Mk II coatings are the hardest, scratch-resistant, and dirt-repellent 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 abrasion while allowing for easy cleaning of water spots and fingerprints. The HD nano Mk II glass is four times stronger and chemically enhanced optical glass. The newly developed coating adheres more firmly and densely to the glass surface at the nano level than before. This results in particles with extremely high density being layered on the glass surface, leading to a hard and smooth coating.