Re: Lighting Ratio

["Rev. Sidney Flack" <sgflack@prodigy.net>]

Isn't it because of the basic math in log exposure wherein each change 
of .3 is a doubling of the one before and half the one to follow on the 
scale?

Peace!
Sidney

Gregory Fraser wrote:
> 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