Depth of Field is the distance in which the viewer can focus on clearly in your light-shows. Depth of Field is useful in creating illusions or a deceptive appearance with your lights. Any master light show artist has a strong feel for Depth of Field.
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Depth of Field is important when giving light-shows particularly because it helps create new shapes and perspectives that the audience otherwise wouldn't see, if both hands were at a stationary distance and equal to one another.
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