Improved protection, performance and durability: Filter coatings do not last forever, because they are worn off through cleaning and use. Also protects against bumps and scratches. A solid scratch-resistant coating is a great advantage and in HD Nano filters, this is the strongest available at present. The polarising film used by Hoya is the same one applied to LCD screens, enabling 25% more light transmission than standard films. The filter has hardly any effect on the colour balance, the contrast or the clarity of the final image, apart from the polarising effects.