JOBO 2521 & Pyrocat: Capacity

Discussion in 'B&W: Film, Paper, Chemistry' started by Bruce Osgood, Aug 12, 2005.

  1. Bruce Osgood

    Bruce Osgood Membership Council Council

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    I'm of the impression that 4X5 negs developed in Pyrocat needs a minimum of 75mL per film. Six sheets would require at least 450mL in the drum.

    Jobo say's the 2521 drum will handle 1500mL for INVERSION processing and 270mL for 6 4X5 is all that is needed.

    Is anybody using the CPE+ with lift and the 2521 drum to develop Pyrocat, could you tell me what capacity you use?

    TIA,
     
  2. Nick Zentena

    Nick Zentena Member

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    The rotary numbers can be exceeded. With the 2551 I've been known to stick 1 litre of fluid in the thing. If you're worried if the tank will handle 450ml just stick some water in it and test it out. Sorry best I can do.
     
  3. schambuk

    schambuk Member

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    Bruce,

    In the unblinkingeye.com article Sandy King cites 50ml Pyrocat HD per 4x5in film. I have read in a subsequent post from sandy to use a 1.5:1:100 ratio in the Jobo. I have been using 300ml of 1.5:1:100 in this Jobo tank using continuous agitation with up to 6 5x4 in the tank with no noticeable problem. I also use the metol variant of Pyrocat.
     
  4. Jim Chinn

    Jim Chinn Member

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    Bruce,

    I started going up to 450ml in those tanks when I started using dillute XTOL. Never had any problems.
     
  5. sanking

    sanking Member

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    Bruce,

    50-60 ml of developer per 4X5 sheet is about ideal.

    If you are developing for silver printing the 1:1:100 will work fine. However, if developing for alternative printing, where you need longer development times for more contrast, use a 1.5:1:100 dilution. (That would be 15 ml of A + 10 ml of B in water to make 1000 ml. )

    Sandy
     
  6. fhovie

    fhovie Subscriber

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    FWIW - I use the Job for standard inversion aggitation and find that 1.25L is necessary to completely cover the film - and give even stain. When I used 1L, I had an edge of the 4x5 film that did not stain properly and the same with the fixer.
     
  7. RGyori

    RGyori Member

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    I use a CPE+ with lift and the 2521 drum to develop up to twelve 4 x 5 negs at a time with 580 ml of developer (TMAX-RS diluted 1:9). Given the JOBO's continuous agitation I have never had any uniformity problems.

    JOBO warns about undue motor wear when using larger developer quantities with this tank/film combination, and thus have limited my quantities accordingly.

    Bob