For some films the Diafine box lists recommended EIs for 35mm and 120, for others there's no mention of format -- meaning I suppose they recommend the same speed. No recommendations for 4x5 sheet. What would be a good starting point for a zone V'ish middle-of-the-range exposure for APX100, TX 320 (current emulsion), HP5+, FP4+, in 4x5 sheet?