</span><table border='0' align='center' width='95%' cellpadding='3' cellspacing='1'><tr><td>QUOTE (David A. Goldfarb @ May 23 2003, 04:15 AM)</td></tr><tr><td id='QUOTE'> was to produce the thinnest (and therefore sharpest) possible negative with the tonality desired, </td></tr></table><span class='postcolor'>
Illogical. Zone I tells you nothing about tonality. Finding your film speed is all about scale over the entire range, not about thresholds at either end.
All Zone I gives you is the thinnest possible negative. But it's that "with the tonality desired" part that's important, not how thin it is.