Last weekend I returned to Edge of the World rapids in Dawsonville, GA. Even in early light there is a nine stop difference from detailed shadows (wet mossy rock) to the light blue sky. I am continuing experimentation with Pyrocat M now that it has a little age on it.

Scene 1 Bridge and River

EV 7.4 to 16.2. Bridge concrete was EV 10.9 in shady side set for Zone VI f22 @ 0.7 seconds, FP4+ EI 100. My 135mm shutter runs about 0.9 seconds at 1, so I cheated the aperature a bit past 22.
Processed EMA style N-

Dilution	Initial Agitation	Subsequent	Total Time	Water Stop	TF5 Fixer	Wash
3.4/2.4/500	2mins	6:30×3 (30)	21:30	1min+	5mins	13+
Good detail in sun lit trees and trees in shadows and river.

Scene 2 Edge of the World Rapids wide angle shot (may crop to pano).

EV 8.5 to 15, dry rock EV 10.1, rapid white water EV 11.5-13, sky EV 15. Zone 5 set for EV 10.2 on the dry rock. Sun was starting to come over trees on right at about 2:00 position from my POV. Exposure f32 2sec + 1sec reciprocity. (1 stop over due to mis-calculation)
Processed Normal Dilution, New time experiment, reducing agitation to 3 1/2 minute intervals to keep acutance.

Dilution	Initial Agitation	Subsequent	Total Time	Water Stop	TF5 Fixer	Wash
5/4/500	2mins	3:30×3 (30)	12:30	1min+	5mins	13+
Negative is dense indicating it is a bit overexposed but there is good detail in shadows and water.

Scene 3 Edge of the World Rapids wide angle shot.

EV 9.3 to 13.9, dry rock EV 10.7, rapid white water EV 12-12.8, bright foreground rock EV 13.9 . Zone 5 set for EV 10.7 on the dry rock. Sun was now over the trees on right at about 2:00 position from my POV. Exposure f22 2sec with 2 shutter clicks of 1 second each. I am told cocking the shutter again may knock the image out of alignment, but we shall see when printed.
Processed Normal Dilution, New time experiment, reducing agitation to 3 1/2 minute intervals to keep acutance.

Dilution	Initial Agitation	Subsequent	Total Time	Water Stop	TF5 Fixer	Wash
5/4/500	2mins	3:30×3 (30)	12:30	1min+	5mins	13+
Negative is normal looking and there is good detail in shadows and wet rocks, shaded trees still show detail, and there is some texture to the white water.

Scene 4 Beached Tree root on the Amicalola river

EV 9.0 to 15.5, rapid white water EV 13-15.5, . Zone 5 set for EV 10 on dry rock. Sun was high and causing bright white water. Exposure f32 for 1second, I could probably have been ok with 1/2 second.
Processed Normal Dilution for estimated N- time, New time experiment, reducing agitation to 3 minute intervals to keep acutance.

Dilution	Initial Agitation	Subsequent	Total Time	Water Stop	TF5 Fixer	Wash
5/4/500	1:30	3:30×3 (30)	11:00	1min+	5mins	13+
Negative is normal looking and there is good detail in shadows, shaded trees, but not enough texture in the white water.

Images to come later

Update: I have not been able to find time to print the last few months due to work and family responsibilities.  However I have continued to experiment with Pyrocat M and have landed at a dilution of 3.5/3.5/500 for a single sheet of 4×5 Ilford FP4+ [EI~100] in 4×5 tank, 70 degrees F, with a Normal time of 12:30 minutes,  2mins initial agitation and 2 interim agitations. For each additional 4×5 sheet I have determined I need .5ml more A and B which brings 4 sheets in a tank to 5/5/500 dilution.  Still experimenting with Delta 100 but it seems to need less time or perhaps less part B . I need to do proper N-1 testing but so far reducing time to 10:30 at this dilution has yielded good negatives.