This variable filter does the job of nine ND filters. Streamline your kitbag and swiftly adjust your F-stop rating to manage light exposure on the fly. Control the amount of light in your image so you can do longer exposures during the day. Shoot in bright light without overexposing your images. Use slower shutter speeds to create dramatic effects that emphasize movement. Accidents happen, so all Okko Pro filters come with a Lifetime Guarantee.