FP4+ developed in a JOBO

Discussion in 'Large Format' started by gudmundur_ing_lfsson|1, Jun 11, 2003.

  1. I just got some 5x7” FP4+ sheet film that I want develop in a
    3006 drum in my JOBO. I have not used FP4+ film since I did
    some tests with it in a Oliver Gagliani workshop sixteen years
    back in 1987. Any suggestions for developer, times,tempature
    and rotation speed and film speed ? I have HC110, Xtol and
    Rollo pyro.
  2. In general, it is often suggested that you take the development time the manufacturers recommend for tray processing, and cut that 15-30% for continuous agitation in a rotary processor.

    I have found that you can see a slight increase in film speed with Jobo processing, again due to the continuous agitation. You can take care of that by calculating your personal EI - there's plenty of information around the web on how to do that since it is typically the first step in playing with the zone system.

    I've been struggling with HC110 and Jobo processing as you can see from the posting just previous to yours today. I can't get my highlight density down to an acceptable level. My next step, maybe, is to work with XTOL since Kodak has done the work and published the times for XTOL and Jobo processing, at least for Tri-X.

    One last thing, do check your rotation speed as some Jobo processors have bigger, stronger, faster motors that others. The book on my CPP-2 says that a speed setting of 4 is 50rpm. Turns out it is actually 86 rpm. Most B&W negative films tend to do best at a speed of about 50 rpm.
  3. FP4+ shot at ISO 125 develop for 6.5 mins at 75 degrees in PMK at 60 RPM.

    CP Goerz
  4. FP4+ "N" development, EI:64, PMK 24C 7' 30", for silver gelatin, Jobo at the slowest speed. Great film and developer combination.
  5. FP4+ has a true speed of 80 (0.1>B+F.) It works quite well with PMK developer, but I can't advise on time/temp for JOBO. PMK in drum processors can cause streaking. I recommend using tray development unless you just don't have the space for a sink that will handle trays.

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