That's helpful. These films differ with regard to shadow placement, but nominal Z2 usually works for FP4, a film I use often enough to be correct with long exp thru sheer experience. But another thing which needs to be differentiated is night exposures which probably don't involve filtrstion, and long daylight exp due to a combo of dense contrast filters and small f-stops. Deep blue filters significantly depress the gamma of most films at long exp and require longer or plus dev. Red and green can differ in this respect between different films. Only Kodak TMax films were engineered with symmetry in this respect, though TMY needs a bit of tweaking for green as I recall (the actual plots are in the lab). Most people don't carry deep blue filters, but I'm tempted to throw one in the pack today.
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