I have the Jobo ATL-2300 instruction manual right in front of me. And I am looking right at the paragraph 7.2 which gives the table of Jobo drums and chemical volume for each type of films. Here is what it says.
1. Tank 1510 - 140 ml (not for 220)
2. Tank 1520 - 220x1 240 ml
3. Tank 1530 - 220x2 330 ml (this is an extension tank)
4. Tank 1540 - 220x2 470 ml (this is 1510 & 1530)
5. Tank 1520 & 1530 - 220x3 570 ml
I think if you follow this table you will have problems. Just look at line #4 and #5. It says to use 470 ml to process 2 rolls of 220 on line #4. But on line #5 it says to use 570 ml to process 3 rolls. It only adds 100 ml to process an additional roll. That's only 1/10th of what Kodak says in Z-131. I think this is very questionable. It's too good to be true. At least it should increase proportionally.
There is a note on paragraph 7.2 on the instruction manual. It says: the quantities listed on the tank and drum tables are the minimum needed. Some processes may require higher volumes for proper processing.
I believe these volume numbers are minimum volume required or each tank and tank combination as well as the number of rolls in order that each roll of film is covered by the chemical. If you put 2 rolls of 220 in a 1520 tank you will need a minimum of 470 ml of chemical so that both rolls will be covered by the chemical.
Besides, this paragraph does not specifically say it's for C-41, E-6 or black and white chemicals. I am certain someone can concur that each type of processing requires different volume of developer for a 220 roll. For these reasons I do not think the numbers provided by Jobo are the correct capacity numbers for Kodak C-41 chemicals.
Last edited by mtjade2007; 10-11-2009 at 12:27 AM. Click to view previous post history.