I have a SK-4G that I would like to use for some e-6 with 4x5 film. But if my understanding is correct it uses about 500ml of solution and then dumps it. If my math is correct that means i would only be getting about 25% an many sheets developed as the chemicals are good for. It does have a "save" setting, but if I'm reading the instructions correctly it only saves one chemical. Hopefully i'm wrong, because it looks like a nice unit to use.