ND Filter Function: The ND filter can prevent overexposure, resist scattered light, reduce shutter speed, increase color saturation to make the picture more transparent and beautiful, and achieve large scale effects such as foggy water and night light tracks. The number after ND represents the dimming ability. UV Filter Function: UV filter is suitable for seaside mountains, snow source and open areas and other environments under the shooting, can weaken the blue caused by ultraviolet light, at the same time for the camera, can protect the lens, can also exclude ultraviolet interference on CCD, help to adjust high definition and color reduction effect. Optical Glass Lens: The lens adopts optical glass, high definition grinding treatment, high light transmittance. Adopting coating light reduction process, almost no color offset. Lightweight and Small: The product is small in size and light in weight, easy to carry around, with a storage box, which can be carried in a pocket or backpack, bringing you more convenience. Multilayer Coating: Double sided multilayer nanometer coating technology, the lens has waterproof, oil proof, anti fouling, and anti scratch performance. Perfectly suitable for DJI Action 2 camera.