Question about the Jobo CPP2

I have a Jobo CPP2 and have a question about film/chemistry capacity. Jobo recommends 8 rolls at a time and I assume this is based on the size of the chemical bottles and the amount of chemistry they can hold. Has anyone used more reels and more chemistry with larger bottles? Also, I have read here that it takes 250ml of chemistry per roll. Is this correct? Thanks - Jim

The CPP2 hits it's limits with 8 rolls of 35mm. That's not the reccommended that's the most rolls you can use. This assumes you're using the 1500 type tanks. With the 2500 type tanks the limit is even lower. The problem is the motor can only handle 1litre of chemical. At least according to the factory.

The amount of chemical is the greater of what the tank requires and what the process requires. It could be 250ml it could be less it could be more.

As Nick said, the upper limits are primarily based on the motor, especially with earlier models. I've pushed my older CPP2 with a 3000 series drum and a lot of chemistry, and you can definitely hear the motor struggle with the load. I try not to do that too often.

Check film/developer manufacturer sites for minimum chemistry requirements for various films. The number Jobo cites are minimums required to guarantee fluid coverage of the film in the tank, not developer capacity. You may find in many cases that you need more than the minimum indicated by Jobo. You may even find, for example, that a fully loaded tank can't hold sufficient chemistry to process the film (I haven't run into this yet, but it is possible with certain film/chemistry/dilution combinations I'm sure). Check carefully - Jobo processors aren't failsafe machines.

-chuck

Thanks guys - The info is much appreciated!