The FREEWELL GOPRO HERO 9 / 10 / 11 / 12 BLACK : ND1000 FILTER is designed for long-exposure outdoor photography of moving objects such as trains, boats, waterfalls, and clouds. By substantially cutting the amount of light hitting the camera sensor, the filter allows you to highly slow down the camera's shutter speed to achieve a natural-looking motion blur effect where you see streaks of colour representing the motion. The filter is multicoated for more precise image quality and is waterproof, dustproof, scratchproof, and oilproof. It comes in a compact magnetic case so you can safely carry it in a bag.