Dev. times between 35mm/4x5

[panchromatic]

Ok i'm a recent addition to 4x5 and I've shot mostly 35mm with some 120 mixed in. Now I shot 3 sheets of efke 25 this weekend and plan on developing them tomorrow. I looked for times of efke 25 in rodinal and they didn't list anything in sheet sizes, but in 35mm and 120. Is there a developing difference in times? I'm using a 55oz developing tank. If there is a standard formula for converting the times i would love to know

or if anyone has feedback on times for efke 25 in rodinal 1+100 or 1+50 for 4x5 I would love to hear them.

thanks in advance!

 

[David A. Goldfarb]

If you're using an inversion tank and the same agitation pattern, then you can probably start with the same time, since Efke 25 is the same emulsion in all formats, then adjust if the constrast is a bit off. If you are using a different agitation scheme (like dip and dunk), then test one or two sheets and adjust the time from there.

 

[panchromatic]

ok i suppose i'll do that. I think i'll expose a few sheets as test before developing anything serious.