One of the first things my assistants do on set before we start shooting is take light meter readings. We always do a series of meter readings so we know exactly where the light is falling on our subject and where it falls off.
Whenever I have a new person on set, we make sure they know the importance of doing meter readings not only during the start of a photo shoot, but during the entire process. If I could point out one mistake I see often it would be someone assuming that the nothing has changed during a photo shoot and not using a meter thoughout the photo shoot.
If you want to improve your images make sure to use a light meter and use it often during your photo shoots.
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