4-Stop Neutral Density Filter (ND16) (4.24g): The ND16 filter is what we use on very bright days to reduce shutter speed by 4 f-stops. We generally use the ND16 filter while filming in the desert or over snow.
5-Stop Neutral Density Filter (ND32) (4.24g): On extremely bright days, the ND32 reduces the camera's shutter speed by 5 f-stops. getting shutter speed near 1/60th - 1/50th, allowing you to capture cinematic quality content even in the brightest conditions.
The following guideline is a good starting point for when to use each filter while filming with your Phantom 4, Inspire 1 or Solo. The goal of this chart is to reduce the cameras shutter speed to 1/60th to give aerial videos a smooth cinematic look, rather than a choppy high shutter speed look. A popular way of filming aerial video is to have your shutter speed at double your frame rate. So, if you are shooting 1080/60, then you want to try to achieve a 1/120th shutter speed. Or, if filming 4K/30 or 24, you will want to be near 1/60th shutter speed.