After extensive trials I've standardized on Acros for 4x5 black and white. Optimum development is in Perceptol 1:3 using Fuji's agitation scheme (continuous during first minute, then 5 seconds at the beginning of each subsequent minute) for 18 minutes 45 seconds at 68 degrees F. This gives an 'N' negative, i.e. contrast index 0.56, and an exposure index of 125 based on Zone I density of 0.1 above film base + fog. Since the 68 degree F time is so long, those of us living in warm climates have the added advantage of manageable 'N' equivalent times at elevated temperatures.
To enable using sufficient developer quantity and ensure perfectly even results, carry out processing in a Jobo 2551 tank. Load four sheets on a 2509n reel, then place another empty reel above it on the core. For all steps use 2 liters of liquid. Start with two sequential water presoaks of several minutes each to wash out the wetting agent Fuji apparently incorporates. Failure to do so will result in bubble marks from foaming, no matter how hard one bangs the tank after agitating. Add 500 ml of Perceptol stock to 1500 ml water (save and reuse once, i.e. four more sheets), a plain water rinse, then alkaline fix in TF-4. The TF-4 should also be saved and reused. Two liters of working solution can fix at least 100 sheets.
I’ve tested a number of paper/developer combinations with the Acros/Perceptol negatives; my preferred combination was grade 2 glossy Bergger NB in Agfa Neutol Plus for two minutes. Outstanding whites, neutral image tone and a perfect match to the negatives' scale for typical sunlit outdoor scenes. Flatter lighting works well with grades 3 and 4. I strongly suggest that anyone interested in similar results give it a try.
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