Adopt high quality optical glass material and highdefinition grinding treatment, firm and Using double-sided multilayer nano-coating technology, the lens has waterproof, oil-proof, anti-fouling and scratch-proof performance. The color cast of the traditional ND filter is avoided by the coating process, can restore the original color of the picture. The of the lens is a protective layer similar to the of the lotus leaf, which prevents water droplets and oil from being absorbed on the surface, making it easier to clean and maintain. ND filter can reduce the exposure of camera, extend the exposure time, and help water or clouds in the photo create a soft, cottonlike texture.