The Freewell ND64/PL Hybrid Camera Lens Filter for HERO9 Black features handcrafted optics designed specifically for use with your HERO9 Black camera. This combination ND and polarizer filter performs the functions of a polarizer including glare reduction and darkening of blue skies to help your camera capture accurate colors. The filter also adds neutral density to the polarizer to help control the camera's exposure settings. The filter absorbs a total of 6 stops of light. The filter maintains the high quality of your camera's optics and its lightweight nature and robust construction make it suitable for use doing drone and gimbal work. To protect the filter from the rigors of production the optical glass features a color-neutral coating that protects it from water dust scratches and oil.