The Jobo CPP-2 and CPA-2 Processors are very similar. They both provide lab-quality processing of film and prints. Both use a recirculating water bath to temper the chemicals, and both have the same maximum capacities.
These processors are designed for advanced amateurs and small labs.
The differences between the two processors:
- The CPP-2 has a cold-water solenoid to allow you to either cool the process down below room temperature, or to quickly lower the temperature of the water bath (i.e. changing from a C-41 process at 38°C to an RA-4 process at 35°C).
- The CPP-2 uses an integrated digital thermometer which allows it to hold the temperature of the process to within + 0.1°C.
- The CPA-2 uses a different temperature probe which holds the temperature to within + 0.2°C. This is really only an issue with the C-41 process.
- It's much easier to set the temperature on the CPP-2. You program the temperature using three knobs for the tens, ones, and tenths of degrees. With the CPA-2, you dial in the temperature with one knob, then tweak it a little after the temperature stabilizes.
- The CPP-2 displays the water bath temperature on a digital LED readout. The CPA-2 comes with a traditional color thermometer. Back to Top
There are primarily three important variables when developing film and prints. The three are time, temperature, and agitation.
When developing black and white film by hand without a processor, you change the development time based on changes in room temperature.
With black and white film, there is a set formula (for a given chemical developer/dilution) that dictates any increase in temperature will result in a decrease in time, and vice-versa.