ADavidhazy <ANDPPH@ritvax.isc.rit.edu> quotes: > This inquiry arrived at PhotoForum HQ ... > > Many years ago, I had a copy of the 'official' f/stops, as promulgated by > > the (then) ASA. This chart listed the f/stops from f/1.0 through f/64 in > > 1/4 and 1/3 increments, and was quite useful in calculating things like > > guide numbers, exposure increases/decreases and DoF ranges. My calculator only goes in the "other" direction, but it does let you calculate the difference between two exposures in whole stops, third-stops, or precise stops (4 places of decimals). Might help. http://imaginatorium.org/stuff/stops.htm Brian Chandler ---------------- geo://Sano.Japan.Planet_3 http://imaginatorium.org/
