"UC" <uraniumcommittee@[EMAIL PROTECTED] > wrote in message news:1193681451.045599.275160@[EMAIL PROTECTED] > Here is the curve for TMY: > > http://www.kodak.com/global/en/professional/sup****t/techPubs/f4016/f002_0507ac.gif > > Here is the curve for Tri-X Pan: > > http://www.kodak.com/global/en/professional/sup****t/techPubs/f4017/f009_0490ac.gif > > Do you see the difference? What part of that line/curve is actually useful for making photographs? You never use the so-called shoulder - it is outside the useful exposure range.