You should white-balance whenever the lighting conditions change. Typically you should apply a new white-balance setting if you change depth, change orientation to the Sun, turn your lights on or off, or any other condition that affects the color or your subject. A general rule of thumb for your filter is: at 10-30 feet a filter will product acceptable results. Below 30 feet too much red and orange is absent and lights are required to return full color to the subject.
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