Today’s mobile devices have amazing cameras, and they do a pretty good job of adjusting to changing light conditions. This is both good and bad for shooting video.
If the lighting changes constantly, the camera will keep trying to adjust for it. This can often happen outside or when you’re in a partially shaded area.
Tip: When you’re outside, shade your device’s lens. Hold a notebook or a purse flat over your device to shade the lens.
Inside shoots are easier because you can control the light much more. If you need to, shine a light on your subject to make the shot look better.
Tip: Don’t have your subject in front of a bright light or sunny window - it will make them appear dark.
It’s always a good idea to a quick test shoot before you begin filming, to check the lighting.