Lens Coating Technology An extremely hardened and waterproof lens coating that is easy to clean and scratch-resistant. Aluminum Ring Each filter weighs only 0.8 to 1.2 grams and does not affect camera performance or flight distance. High-Quality Color Coating Easy Installation Complies with EU ROHS environmental standards for pollutants. The UV filter primarily prevents UV light from entering the camera, which can cause bluish light effects during flight. The ND filter reduces the amount of light in very bright conditions, allowing the camera to choose the correct exposure value. It also enhances the color saturation of the image, making it clearer and more vibrant. You can also use a slow shutter speed to capture special effects. The PGYTECH ND filter (Professional) uses German SCHOTT glass as its base material. Package includes: 1x ND128, 1x ND256, 1x ND1000.