It's occuring to me more and more that the DIN system for film speed and exposure index is the smartest system, yet nobody writes articles using it, nor do we see many comments based on it on APUG. Unlike the ASA system which demands to memorize at least parts of the scale to know what numbers are following each other, the DIN system needs only two numbers: 1 and 3. Need to go up one stop? Add three. Need to go up by the minimal amount, i.e. 1/3 of a stop? Add one. So all you Europeans, have you followed the way of the majority or do you still believe in DIN? All of you Americans, do you wish you could convert to DIN and stop fussing with numbers?