1. Multi-layer coating filter, high transmittance and high light to restore the true color 2. Using professional optical glass lens, the image is clearer 3. Protect your expensive lens from dust and scratches without degrading photo quality. 4. Material: Aluminum alloy + optical glass Features of different filters: 1. UV filter: Suitable for shooting in the seaside, mountains, snowfields and open areas, etc. It can reduce the blue tone caused by ultraviolet rays. At the same time, for the camera, it can also eliminate the interference of ultraviolet rays on the CCD, which helps to improve the effect of sharpness and color reproduction. 2. CPL Filters: Increases color saturation, creating deep, rich scenic images. Helps to reduce the amount of light entering the lens. 3. ND Filter: You can get more freedom to control aperture and shutter, bring more exposure methods and creative space for photography creation, and effectively prevent overexposure. The number behind ND represents the ability of the ND mirror to block light. 4. Black Mist 14 Soften harsh shadows: Use this black mist filter to soften harsh shadows, reduce unwanted reflections and lens flare for a more even light distribution for natural and pleasing images. 5. NIGHT Anti-light Pollution Filter: It can effectively reduce light pollution and make the picture show real color. (Not all model type and styles include the above features, you can choose filter styles according to different effects) Note: 3 in 1 CPL ND1664: CPL, ND16, ND64 4 in 1 CPL ND832128: CPL, ND8, ND32, ND128 4 in 1 CPL ND1664 NIGHT: CPL, ND16, ND64, NIGHT 6 in 1 Mixed Filter: UV, CPL, ND16, ND64, NIGHT, Black Mist 14