I am still trying to figure out bits and pieces of the Zone system and ran into an interesting situation. I exposed a piece of Tri-X at f64 for 35 seconds. Th en adding in extra time for reciprocity failure, came up with a final exposure o f f64 for 130 seconds. According to a class I took, when compensating this much for reciprocity failure, I should decrease my development time by 20% (hence N - 20%). When my N development time is 5.5 minutes, then N-20% is 4.4 minutes. Everything I've read and heard says that you shoud never develop for less than 5 minutes.
In a case like this, where the calculated development time is under 5 minutes, h ow should one compensate to bring up the development time to >= 5 minutes? Shou ld one lower the temperature of the developing solution a couple of degrees?
Thanks for all ideas/suggestions, Robert