Going JOBO

Discussion in 'B&W: Film, Paper, Chemistry' started by Rolleijoe, Aug 18, 2005.

  1. Rolleijoe

    Rolleijoe Member

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    Hi, I'm finally taking the plunge and going with JOBO after more than 20+ years using Patterson. I understand that I'll be using MUCH less chemistry, but how do I figure out how much of what I'll be using? Any & all help appreciated!

    Thanks,

    Rolleijoe
     
  2. resummerfield

    resummerfield Subscriber

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    I process in the 2500 series tanks, and use 170ml for each 35mmm roll, and 210ml for each 120. Thats with the 2553 and 2563 tanks, but I think it would also work with the smaller 2 reel tanks.

    For times, start with about 10% less, and adjust.
     
  3. C Rose

    C Rose Member

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    The chemistry amount should be listed on the selected JOBO tank you are using.... for the format of film you are processing. Are you going constant agitation? I process in varying JOBO's with constant agitation and have been very happy with results thus far. So little chem. needed at high dilution, nice..... HC110 at 1:50ml

    Good luck
    Cynthia
     
    Last edited by a moderator: Aug 19, 2005
  4. Bob F.

    Bob F. Member

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    Also bear in mind that if you are switching to continuous rotary agitation, your development times will need to be adjusted downwards. Ilford suggest 15% as a starter. Jobo manuals for drum systems still online (for now...) at Jobo-USA (http://www.jobo-usa.com/support.htm#Instruction Manuals).

    Cheers, Bob.
     
  5. Ronald Moravec

    Ronald Moravec Member

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    Pay attention to the mimimum chemistry to get the job done. With dilute developers and low volume, there may be insufficient chemical.
     
  6. Nick Zentena

    Nick Zentena Member

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    They only use less chemicals if you rotate the tank. The 2500 tanks use alot of chemicals if you try inversion.
     
  7. Mark Layne

    Mark Layne Member

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    For 35 and 120 I went to back to Patterson tanks.
    I did not like the lack of acutance I found with constant agitation.
    Doesn't seem to matter as much with larger film
    Mark
     
  8. Rolleijoe

    Rolleijoe Member

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    HC-110 @ 1:50

    Hi Cynthia, thanks for the information. I haven't received the equipment yet (buying from a gentleman selling off his entire darkroom, which seems now to be mine). I had thought that the reason for JOBO was constant agitation? I guess there's going to be a long learning curve in sight!

    I also use HC-110 @1:50. But if I mix up that much, won't I be wasting so much of it if I'm only using mL?? I always use it as 1 shot, so maybe I should wait until I have enougn to use all 50oz? But that would take forever.

    I'm shooting mostly 120 Rolleiflex, and occasional 4x5. I know I'll have to do some experimenting, as I go along. Thanks again.
     
  9. Wally H

    Wally H Member

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    The correct amount of chemical "may" not be what is listed on the JOBO tank(s)... some developers work better when more chemical is used (such as some diluted ones)... I use a developer that suggests that 500ml be used per roll... If you "DO" go that route (larger amounts) be aware that some JOBO tanks do not hold that much developer... In my case, I use a larger tank with empty reels when I only have one roll to process...
     
  10. C Rose

    C Rose Member

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    Hey Rolliejoe
    I use ml dilution 1:50 so I only mix up what i'm use each time as well. As far as not having enough chem in the tank I have not yet run into that problem as Wally states above. I am aware that it may be a concern.... but for now it has not been a problem.
    I've been mostly processing med. format tri-x. but I'm experimenting with Efke now
    BTW love the HC110

    -Cynthia
     
  11. Tom Hoskinson

    Tom Hoskinson Member

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    You may not know if you are using the optimal amount of chemistry - and rotational speed (for continuous rotary processing) unless you do controlled comparitive testing.

    My Jobo system has been sitting unused (for about 5 years now). I process all my B&W film (35mm thru 8x10 sheet) in tubes, tanks and trays using minimal and semi-stand agitation.

    I'll go back to the Jobo if I start processing color again.
     
  12. fhovie

    fhovie Subscriber

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    It really is very expensive to try to save money on chemistry by using too little - I use the Jobo 2500 series for 4x5 and multiple rolls of 120. I use it for hand inversion and it takes 1.25L to completely cover the sheet film. Using PMK, Pyrocat or most other one shot developers, this is not expensive compared to ruining the film with over tired developer or with uneven staining. Same with fixer - better more than less.
     
  13. Frank F

    Frank F Member

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    Some users get a hypodermic like device to measure small volumes of HC110.

    Or get a .. now I forget the name of the thing..... a really small graduated tube that requires suction ( a small rubber bulb) to get the chemical up there and measured. They cost around $1, and are reuseable....they meaure in quantities of 1-10mL.
     
  14. Bruce Osgood

    Bruce Osgood Membership Council Council

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    Pipette.
    There are two types. The one I have is 10mL and you fill it to 10 and release to the amount you want. It is graduated from 0 to 10 down. There is another type that works in the opposite - you fill TO the amount you want. 1 -10 UP.

    If you buy the mechanical pump kind you are speaking of BIG bucks. Mine is a plastic pipette with bulb and cost under $10. I just don't remember where I bought it.