ND32/PL: The ND32/PL reduces 5-stops of light and also polarizes the scene. This filter can be used for video or longer exposure photos. For video this filter would be used on a sunny day at a lower aperture (f2.8 or f4.0).
ND64/PL: The ND64 filter reduces 6-stops of light and polarizes the scene. The ND64 filter could still be used for video if shooting wide open (f2.8) on a bright sunny day. The other use of this filter is to reduce 5-stops of light for longer exposure photography.
ND128/PL: The ND128 filter reduces 7-stops of light and also polarizes. This filter will be exclusively for shooting photos. You would never use this for video. The ND128 filter is going significantly reduce the light to the sensor allowing you to shoot creative long exposures during the day.
PolarPro’s high power ND filters enable photographers to capture long exposure shots during daylight hours. Natively there is too much light for the Phantom 4 Pro and Advanced to shoot long exposure during the day. A heavy ND filter such as an ND64, ND128, or ND256 will help cut down light unlocking longer exposures during the day.