The winter has kept me idle for photography for a while. I managed to shoot a few rolls last weekend. I am ready to process the films with my ATL-2300 using Kodak's C-41 chemicals. Well, I have had a long history of processing problems in E-6 (and probably in C-41 as well) so I am trying to be very careful this time to make sure I do everything correctly. I looked up Kodak's web and found tech pub Z-131 sectin 3. In this pdf document there is the capacity table of Kodak's gallon sized C-41 developer for various format of films. It says 5 rolls of 220 negatives for the gallon without replenish. So that's 760ml for one roll of 220 negative. If this is true I have a problem. I can't process my 220 rolls with this chemical on my Jobo ATL-2300. Take Jobo 1540 tank as an example. This tank can be loaded with 2 rolls of 220. But the max amount of chemical it can take for rotary processing is 470ml. Obviously it can not possibly develop 2 rolls of 220. And obviously it can not process even one roll either. I now suddenly realize why I have not been too happy with my c-41 runs in the past year of dozens of rolls of 220 negatives. Somehow my 35mm runs were OK but not the 220 runs. I have had poor results of E-6 runs for the same reason only been more obvious. So is Jobo specs of the capacity of 2 220 rolls in one 1540 tank with 470ml of chemical deceiving or is it Kodak's C-41 developer lack the strength for my Jobo processor? Kodak's tech pub z131 says the gallon sized developer is designed for rotary processing. But its capacity table says no it is too weak. The 1540 tank is already 8 inches long. With only one roll of 220 in it more than 50% of the tank is empty. I would feel very funny to use even bigger tank in order to accpt 760ml of developer. Just processed a 220 roll of NPS160. The negative came out a little thiner than I would have liked. I think this roll is basically ruined again just like my dozens of rolls before. This time I seem to have a clue. The Z131 says it all. Oh well, Can Kodak do something this small right? How can I possibly use the gallon developer to develop 220 negatives even one roll at a time? At least I would expect the developer potent enough at 470ml to process one 220 roll. I have been buying only 220 rolls and now I think I am stuck with the developer and ATL-2300 unable to process the 220 rolls. I can foresee someone to come out to say the chemical is capable at 470ml for 2 rolls. It will do it but will never yield the colors that I have been waiting for from Portra UC, NC and VC. I once processed a roll of VPS-3 expired 3 years. I was shocked to see how good it was. It was a 35mm/36 roll. Now I finally know why. Kodak has been always a respectful company for me but once again I feel disappointed. I now have no choice but look for chemical alternatives, perhaps Trebla chemicals which is available here.