NiSi Filter Circular Polarizer True Color Pro Nano This filter have an exclusive polarizer coating film, which cuts out reflections from non metal surfaces and provides true color without the warming cast. This feature not only reduses unwanted reflections, but provides a waterproof barrier on both sides of the filter, scratch resistance and added oil resistance. This allows easy and effective cleaning of dust, finger prints and water stains. video by @astrofotografen | Focus Nordic