Why is the illumination difference in a 3:1 lighting ration 1 1/3 stops and not 1 1/2 stops? Is it because the f-stops on cameras and meters tend to be divided into thirds or is there a mathematical reason? Greg
Why is the illumination difference in a 3:1 lighting ration 1 1/3 stops and not 1 1/2 stops? Is it because the f-stops on cameras and meters tend to be divided into thirds or is there a mathematical reason? Greg
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