Thank you for the feedback and I appreciate the corrections as well. I "assumed" they had targetted a gamma of ~0.63 or 0.62 simply based on the results data, as in Haist there was no specific mention of the actual target. Regarding the third film, I was not aware they had also tested Plus-X. Unfortunately only the Pan-X and Tri-X experiments are mentioned in Haist.
At one point I also thought there might have even been more developers too, filling in the numerical gap between AH-4 and AH-15.
I'm attaching the corrected PDF for reference.
I am still fairly puzzled by some of the results, which is why it would be interesting to redo this experiment with current films. For example, based on the Altman and Henn Tri-X results, I'd probably have to conclude D-76 was a virtually ideal match to that particular incarnation of Tri-X and must have worked exceedingly well with it, giving the best possible results for each of the variables in the triad. At least when it comes to the AH Metol-sulfite developers and variations, D-76 could not even be bested in any one characteristic, let alone two or three.
We might also conclude that although every film had to pass certain tests in D-76 to be released by Kodak, D-76 may not have been a great match for Panatomic-X. I am basing this on the D-25 (AH-3) results, where a developer known to be of the "extra-fine grain" type, produced the expected granularity reduction, but a relatively small speed loss, and no loss of acutance compared with D-76 1+1.
Last edited by Michael R 1974; 12-20-2012 at 10:31 AM. Click to view previous post history.