Actually I meant to say was 1 2/3 not 1 1/3. > Gregory Fraser <Gregory.Fraser@pwgsc.gc.ca> writes: > > > > 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? >
