I develop Tri-X 4164 sheet film (ISO 320) at 16 minutes @ 70 degrees F in Rodinal 1:100 for N development, 12 minutes for N-1, 9 minutes for N-2, and 7 minutes for N-3. For roll film (mainly Delta 100 & 400) I use PMK.(posted 9155 days ago)http://www.ravenvision.com/rvapeter.htm