DJI Mavic Air Accessories, Use the ND4/CPL at dusk and dawn while shooting at 1/250th needing polarization, and reduce shutter speed by 2 f-stops. Use the ND8 in in partly cloudy conditions while shooting at 1/500th, and reduce shutter speed by 3 f-stops. Use the ND8/CPL in cloudy conditions needing polarization, and reduce shutter speed by 3 f-stops. Use the ND16 in partly to mostly cloudy settings shooting at 1/1000th, and reduce shutter speed by 4 f-stops. To film the highest quality video from your drone, you want to use lens filters to be able to adjust your shutter speed to double your frame rate. This makes each of your frames crisp and your videos much smoother. Polarization increases color saturation and reduces glare, but should not be used in low light settings or when shooting certain subjects like reflections or shady areas. After you attach a polarized lens filter to your camera, look through your viewfinder and rotate the lens filter until you see bright objects darken, so you know you have the correct polarization angle.