Generally speaking, rotary processing (JOBO) uses less chemistry by far than any stationary method.
You must ALWAYS use at least the minimum volume of concentrate specified by the developer manufacturer.
So if a 100ml bottle is spec'd to develop 10 rolls of film, you must use 10ml for every roll being developed.
This always applies to the volume of concentrate used, regardless of the dilution.
A "roll" in this context is any combination of film that can be proofed on a single 8x10 sheet of paper.
So that includes a 36-exposure 35mm roll, one 120 roll, four 4x5 sheets, or one 8x10 sheet.
Here's the JOBO instructions for their smallest tank:
Note that 270ml will do six 4x5 films. I added the red line at the top of the liquid level.
HOWEVER...
If you use a compensating developer in any rotary system, you completely lose the compensating effect.
- Leigh
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