. The ND4 filter allows 1/4th of the light to pass through, which is equivalent to a 2-stop filter. The ND8 filter allows 1/8th of the light to pass through, which is equivalent to a 3-stop filter. The ND16 filter allows 1/16th of the light to pass through, which is equivalent to a 4-stop filter. The ND32 filter allows 1/32nd of the light to pass through, which is equivalent to a 5-stop filter. Each filter is suitable for the DJI Mavic Pro drone.