I've settled on 1+2 dilution for basically the same reasons John states: fine graain, good sharpness, good speed, economic usage, reasonable development times at 75 deg. F (~9 min).(posted 9323 days ago)I have in the past used 1+3 dilution for 120 film. There is a bit of a compensating effect at this dilution. No capacity problem with Patterson plastic tanks and reels.