Moment has 5 point list of things you can do to improve the quality of your videos. In short they are:
Use a tripod to make your video steady.
Lock your camera settings to avoid shifting light and white balance.
Use window light when you shoot indoors.
Use a wide lens to avoid video cropping in your phone.
Shoot slow-motion outside where there is enough light.
Read the full article at the Moment Lens Company website.
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