I use Tmax400 with XTOL 1:1 for 35mm and TriX400 with D-76 1:1 for Medium Format. While the latter combination is quite forgiving in terms of variations in development, the former combination is quite UN-forgiving. Until I nailed my process down with exacting temperature control and timing, I constantly got too high of contrast.
Later, I did some exacting test while keeping temperature variations to +/- 0.5F during the development phase, I managed to get predictable good results. What I resorted to doing was to prepare everything including extra water, water bath, and chemicals, about an hour ahead and let them stabilize to the room temperature. Then, pre-wash the film in tank using the above water to let the tank temperature come to the fluid temperature, then process with chemicals using exact agitation schedule and timing. I made a chart of development time in 1F increments based on published figures.
I must say, the result is quite pleasing.
Just to give you an idea, I did some test using my own development tank and plain water. During 8 minutes or so shake and standing, what used to be 70F water raised to about 72F. I'm sure with chemical reactions, actual developer will rise more. This is the reason I decided to be extra careful and use water bath for development cycle.
Contrast to this (no pun intended), I can develop TriX without water bath or pre-wash and results are always quite acceptable.
Speaking of setting of ISO, I initially used ISO 200 for above films. Today, I use box speed. My metering skills are not where it needs to be, so looking at my results I decided to stick with box speed for now. I have some more work to do in terms of perfecting my development skills. I didn't want to complicate the process any more than necessary for the moment.
Good luck with your experiment!
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