I have some questions conserning the use of the JOBO CPP-2 processor with the 3005 Expert Drum. The CPP-2 I purchased is many years old (but hardly used) with a new Lift. Even though I bought the processor “used” I have made quite an investment in this equipment. However there are obvious obstackles involved. In the info on the 3005 Expert Drum JOBO states that one can use a maximum of 630ml for 5 sheets of 8x10/5x7. I have been using a maximum of 630ml chemistry for 5 sheets of 5x7” film and getting flat negatives. Trying to solve the question I got Anchells book on film developing. He states that using a diluted developer (Rodinal 1:50) the minimum amount of chemistry needed is 250ml per sheet 5x7 (page 31). Using the max limit of 630ml combined with Anchells info means that I can only develop 2 sheets at a time. Is that what photographers end up doing with the CPP and 5x7” film? I have loads of film to be developed, and I don’t want to ruin more film. I regularly cut film speed in half, and I ensure that the shadows are fully exposed. Following Anchells recommodations for rotary film development I want to use high dilutions (Rodinal 1:100, Xtol 1:3) but not being able to develop more than a couple of sheets at a time doesn’t appeal to me. JOBOs own recommodations are in conflict. The US branch tells me it’s OK to use 1000ml with the 3005, whereas the German representative states “The max. filling quantity at CPP-2 with Lift is 500ml !!! (and only a minimum level in waterbath)”. Anybody out there with real CPP-2/3005 Expert Drum/high dilutions of developer experience?

-- Sverre Aurstad (sverre.aurstad@bokklubbene.no), June 11, 2001

Answers

Response to Chemical capasities

Greetings,

I don't frequently use highly dilute developers, but I have a CPP-2 and use the 3005 drum with 1000 ml of chemistry. I think JOBO may recommend against using that much chemistry is to lessen the strain on the motor. When you're lifting a drum with a large quantity of chemistry, you need to lift it using your hand under the drum cradle. If you just use the lift handle it will break; another reason why JOBO probably doesn't recommend using 1000 ml.

Regards,

-- Pete Caluori (pcaluori@hotmail.com), June 11, 2001.

Response to Chemical capasities

Another note on JOBO tank capacities. Last night while paging through Gordon Hutchings' "The Book Of Pyro" he states that he uses 2000 ml in a JOBO 3005 tank.

Regards,

-- Pete Caluori (pcaluori@hotmail.com), June 12, 2001.