Quote:
Originally Posted by Photo Engineer  DF has shown it well. IC, note that in that table, you are talking about 3 films in 4 different developers and the fact that they may have the same coefficients is merely coincidence. So, in that table, Royal X pan in Polydol behaves like Super XX in HC110 B. In DK-50, these two films are a 34 and a 36 which would be quite far apart. And as the above charts show, behavior is non-linear.
PE |
34 and 36 are indeed different numbers and the wheel behavior is non-linear, as I pointed out in my equation for the wheel.
My contention is that there is absolutely no alteration of the temperature-compensation function of the dial based on anything in the chart!
The wheel and chart predict that ALL combinations film/developer with a baseline time/temp of 8min at 20c have the SAME time at 18c!! You can find the time at 18c by using the wheel or the spreadsheet; they give the SAME answer.
Please show me any two film/developer combinations in the chart the have the SAME baseline time at 20c and have DIFFERENT times at 18c based on the wheel and chart!
How can you imply the speadsheet 'may not work' when it gives the same numbers as the wheel?
(PE: this is a 'friendly' gentlemen's argument, so 'no flames' OK. I'll 'eat crow' if you show me to be wrong.)