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Old 12th April 2021, 11:14 AM
beetcleaner beetcleaner is offline
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Default Jobo CPE2 development times

I've managed to pick up a Jobo CPE2 rotary processor. Is there any advantage in using this system over standard black and white developing techniques and if so does the developing time have to be reduced?
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Old 12th April 2021, 11:40 AM
Quendil Quendil is offline
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I’ve just got one myself and would also be interested in B&W developing. I haven’t had chance to use mine yet


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Old 12th April 2021, 11:45 AM
John King John King is offline
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Default Jobo processor

The constant agitation is recommended on the Ilford website that the times should be reduced by 15%. I find this to be insufficient reduction and always ended up with quite contrasty negatives. So it may take a bit of experimentation.

Use the stop bath for 30 seconds and the fixer for the same time.

As it happens I have gone back to hand processing for B&W because of this, but still use the water bath to stand the tank in to keep it up to temperature.

However For processing Ilford XP2 (That uses colour technology) the development times remain the same. Likewise C41 colour films there is no change either.
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Old 12th April 2021, 11:47 AM
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MartyNL MartyNL is offline
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I've used rotary development on a motor roller base for years. I believe the main advantage is practical, being the reduced volume of chemical to cover the film and that your hands are free!
The rest is pretty much negligible in my view.
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Old 12th April 2021, 12:10 PM
mpirie mpirie is offline
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Purely by coincidence, i was standing over my CPA2 yesterday wondering what i'd do if the heater element failed and i couldn't find another.

There are numerous other ways of processing film but i like the Jobo because it's consistent and i've tailored the processing workflow to suit. I also like that it keeps the chemicals at a constant temperature too.

It is difficult to tame contrast with constant agitation but dilute or compensating developers can help.

Mike
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Old 12th April 2021, 12:33 PM
big paul big paul is offline
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Hi I have been using one for years and I use the standard developing times ,I dont reduce them ..I do find I get a bit more contrast with constant agitation and that I like I use the slow speed ,and when doing B/W I don't put any water in it ,just make sure the heating element is OFF
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