Response to Fortepan 400 with ilford developers

www.phototec.de offers a development times calculator. For FP 400 at EI 200 (gamma 0,55), this calculator recommends 9 1/4 minutes in Ilford Perceptol stock solution (as opposed to 12 minutes for EI 400, gamma 0,62), both for 1-minute rythm at 200C. For Perceptol 1+3 the times are 15 1/2 minutes and 20 minutes, respectively. There is a disclaimer identifying these values as extrapolations on the basis of manufactuer's data and a mathematical model. However, it's better than nothing. If you need data for other temperatures, rythms, or gammas, visit the above URL. Although the calculator is in German (Entwicklungszeitenrechner), I believe you will be able to guess what to enter where.

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