So I finished a Zone I test on TXP-320 / 120 film with my Mamiya 645. I want to finish doing the Zone VIII test before moving on to my field camera. According to the way Fred Picker suggests doing the Zone VIII test, he says to expose a whole roll on Zone VIII and cut it into 4 pieces for separate development. It doesn't seem like there would be enough film on a 120 roll to do that, so I'd like to use a 220 roll instead. Is 220 TXP the same as 120 TXP ? That is, will the EI that I determined for the 120 film apply to the 220 film too? I'd rather not have to go back to square one.
Of course, if there's a better way...
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