I'm souping tech pan in diafine at an E. I of 80. Results are better than technidol and ethol TEC, with little increase in grain size. Rodinal is usable at 100:1 but at an E.I. of 12. The negatives from diafine seem to have a broader range of tones. The trick is to soup in the "b" solution for exactly 60 seconds to get a "2" contrast. The longer times in the "B" solution build contrast. Other wise, time in the "A" solution (3-5 minutes), temperature( 70 -85 F ) and agitation (once a minute) have little effect.(posted 9129 days ago)It also works wonders on T-max as all development variables are eliminated!!!
I recently thrown out d-76, ethol TEC, T-max, Rodinal and microdol developers and am learning not to worry about film development as a variable in my work.