I am going to start shooting FP-4 Plus in 5x7 sheets, due to the cost and lack of availability of T-MAX. I normally process my T-MAX 5x7 in a Jobo, using X-Tol developer diluted 1:2 at 24 degrees Celsius (75 F). My times are 6.5 minutes for TMX 100 and 5.5 minutes for the new, improved TMY 400. I vary the dilution for N+1 (1:1) and N-1 (1:3), without changing the time.
I am just looking for a ballpark first-try start time for FP-4 Plus. Any example would be helpful; I can extrapolate and test from there. If anybody out there has ever processed both FP-4 and TMAX in the same developer, you might be able to give me an idea how far apart they are (or how similar they are).
Thanks in advance.
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