Simple and Portable: ND filter is small in size and easy to carry. It has storage box and can be carried in pocket or backpack. Nano coating: Double sided multilayer nano coating technology, the lens has waterproof, oil proof, anti fouling and scratch proof performance. Use Purpose: Prevent overexposure, resist scattered light, reduce shutter speed, increase color saturation to make the picture more transparent, achieve large scale effect, and bring more exposure methods and imagination space for photography creation. ND Lens filter: Lens adopts optical glass, high definition grinding treatment, the number behind ND represents the light reduction ability. Avoid color cast: Adopting coating light reduction process, avoiding the problem of traditional ND lens color cast, almost no color cast.