I'm very new to processing my own 4x5 TMAX100, but have been reading and learning alot. I understand what N-1, N-2, N, N+1, and N+2 mean, but I don't understand how to determine how to carry out these developments. I know that you can change your development times, or you can change the dilution of your developer and the agitation cycles. If I want to move a highlight from zone VIII down to zone VII while retaining detail in shadow at zone III I would want to use an N-1 development. But I don't understand excaclty how to do this. I'm shooting TMAX100 and processing 4x5 sheets in tanks with hangers, and using TMAX RS diluted 1:4 for normal development.