Irix Edge Neutral Density (ND) filters are an essential tool for long exposure photography and depth of field manipulation. They reduce the light passing through the lens and help create striking, surreal images. The special waterproof and oil-repellent NANO coating protects them from smudges and fingerprints, and allows use in extreme weather conditions. Its low profile frames and knurled edges provide very good grip and functionality with an aesthetic design in harmony with all Irix products.