View Full Version : FP4 Rotary Processing Times with Rodinal and HC-110
natelfo
30-Jan-2014, 10:35
I just shot my first few shots with FP4 in 4x5 after only having used T-Max and Tri-X. I know that I need to do testing to fine tune, but I'm looking for a good starting point times for rotary processing in a Jobo with both HC-110 dilution H and for Rodinal at 1+50. I shot the film at ISO 100. Looking at the FP4 sheet, it says to decrease the tank times by 15% for rotary processing. Would the listed times -15% be accurate, or have people found otherwise? If you post times, could you please also list the temp.
Thank you,
Nathan
FP4 times are mostly wrong, in my experience.
If shot at 125, you want to keep those 15%, and sometimes need even more time (D76, ID 11 and Tmax DEV), i have a feeling this will be the case as well with the rodinal and HC110, but others might have exact experience with said developers.
adelorenzo
30-Jan-2014, 11:35
I rotary process FP4 sheets shot at ISO 125 in HC-110, 1:49 for 8 minutes. I started with 9 minutes (11 minutes - 15% for rotary processing) and found I got negatives too thick for my liking. I use 300 ml of developer (6 ml of syrup) for up to six sheets of 4x5 in a 2500 Jobo tank or two sheets of 8x10/whole plate in a Unicolor drum.
YMMV of course.
Massive development chart. Use those times for starters.
ic-racer
30-Jan-2014, 13:02
Make sure your drum or processor can handle it. Dilution H works out to 945ml in a Jobo Expert drum with 10 sheets of film. (6 x (10/4) x 63)
I just shot my first few shots with FP4 in 4x5 after only having used T-Max and Tri-X. I know that I need to do testing to fine tune, but I'm looking for a good starting point times for rotary processing in a Jobo with both HC-110 dilution H and for Rodinal at 1+50. I shot the film at ISO 100. Looking at the FP4 sheet, it says to decrease the tank times by 15% for rotary processing. Would the listed times -15% be accurate, or have people found otherwise? If you post times, could you please also list the temp.
Thank you,
Nathan
Nathan, the recommended time to develop FP4 with HC-110 solution B, using occassional agitation is 7-9 min at 20 deg C. When using the Jobo, one is supposed to decrease the time by 15% or 85% of 7-9 min.
I use 85% of 7 min which tranlates to 5.95 min. I round that to 6 min. I never tried solution H.
StoneNYC
30-Jan-2014, 23:43
Just did my first round with FP4+ in DD-X, 15% was almost right, might have even reduced it another 5%.
Unfortunately as I've learned, you have to do your own testing, depends how you meter etc.
Just do it! :)
Tim Meisburger
31-Jan-2014, 00:52
I will only say that I dislike rodinal in a processor (I use a Patterson Orbital on a motor base), but like it for stand processing. I did a test last week and the extra detail evident in the stand developed negative (1:100 for an hour) compared to the machine developed (1:25 for 5.5 minutes) was astonishing. Maybe its a factor of dilution rather than stand vs. machine.
For other developers I'm fine with the machine, just rodinal seems different.
StoneNYC
31-Jan-2014, 00:57
I will only say that I dislike rodinal in a processor (I use a Patterson Orbital on a motor base), but like it for stand processing. I did a test last week and the extra detail evident in the stand developed negative (1:100 for an hour) compared to the machine developed (1:25 for 5.5 minutes) was astonishing. Maybe its a factor of dilution rather than stand vs. machine.
For other developers I'm fine with the machine, just rodinal seems different.
I would agree with that, my second batch of rotary processed Acros100 in Rodinal (Which I usually love hand processed) was very "unsharp" compared to the grain I'm used to with the same film/developer.
That said, again, I'm new to rotary processing. But one run of bad combo like that and I'm immediately looking for a better match. I hope not all rotary processing is so murky... I'll be very disappointed as I was thrilled to let it just go on it's own and sit back and watch...
Maybe its a factor of dilution rather than stand vs. machine.
Dilution is most likely the reason.
I expose FP4 at 80 ISO and develop in HC-110 dilution H for 10,5 minutes at 21˚C (70F).
Jobo tank, constant rotation.
It's mostly good, but sometimes I feel like an extra 90 seconds would be better.
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