The DJI Osmo Action ND Filter Set includes three ND filters for your Osmo Action 3 or Action 4, designed to reduce the amount of light hitting the camera's sensor for better exposure and motion in bright conditions. The set features ND8, ND16, and ND32 filters, which reduce light intake by 3, 4, or 5 stops respectively. This enables you to extend your shutter speed without overexposing your image, while enhancing motion blur. The filters attach easily to your camera without tools and are made from AF-coated glass that is both water and stain-resistant.