Quote:
Originally Posted by Photo Engineer  I was pointing out that you have one set of constants for the entire equation, but Kodak points out that the wheel must be adjusted in a non-linear fashion and they give a matrix as I described, of different constants for each film and developer. I was wondering how your formula could do that, as it seemed not able to take into account all of the Kodak constants.
PE |
Ok, I think I see what you are saying, my wheel may now be outdated. My 1974 Kodak wheel has a table with numbers in the 30s to 40s, but there is nothing that interacts with the wheel function. For example, in the table in front of me, all 4 film/developer combos that have number 38.5 all have a baseline time of 9 min at 20c and about 10.5 min at 18c based on the wheel. There is no notation that one would spin the wheel farther or differently for each of the 4 different combinations. I agree with you 100% that those different film/dev. combos probably won't respond the same, but my wheel says they do, and the equation follows the wheel exactly. The best thing as you are saying would be a separate equations for each combination, but as far as I knew Kodak never provided this until I saw the T-max literature, at which time I deciphered it to come up with a new equation.