OK, last installment in this batch; Delta 3200 in DD-X.(posted 8451 days ago)My goal was to find the appropriate continuous agitation development time for Delta 3200 in DD-X at EI 1600 to match my intermittent agitation results.
The big surprise was that this film needed only 15 percent less development to match EI and curves.
So...to sum up, looking at three films, two "core-shell technology" types and one a traditional-grain type, I found that the reduction in development time needed for continuous agitation rather than intermittent agitation ranged from 15 percent to 35 percent, that for two of the films the EI remained the same while one dropped to its ISO-rated speed, and that the curves are pretty much all the same within the 14-stop range tested. I'm thinking that for the one curve that showed a droopy high end, the causes were probably using too much developer dilution to cope with whatever development byproducts that film produced _and_ whatever extra aeration was produced by continuous rotary agitation.
My next step will be to test a couple of sheet films in a Unicolor tank on a Uniroller and see if their development results match that of roll films in the Jobo.
The purpose of all this is to reduce the number of errors in the process or iow, to reduce the "how come?" factor.