where to get times for Jobo B&W development

Discussion in 'B&W: Film, Paper, Chemistry' started by vedmak, Sep 25, 2010.

  1. vedmak

    vedmak Subscriber

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    Recently got Jobo cpe, but massive dev chart does not have times for Jobo is there a reference for those times? If not what should I start with Rodinal using films like Foma 100, Adox 50, Tmax 100?
     
  2. Alistair Wait

    Alistair Wait Member

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    I am using one and taking 15% off the times given in MDC. Seems to be working fine.
     
  3. Alistair Wait

    Alistair Wait Member

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  4. Sirius Glass

    Sirius Glass Subscriber

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    I carefully followed Jobo's instructions and reduced the development time by 15%. The film came out underdeveloped. After posting here and other forums, I found that a majority of the respondents use the full amount of time and only reduce the processing if and as necessary. This guarentees the the negative will be printable from the start.

    Steve
     
  5. Tom Kershaw

    Tom Kershaw Subscriber

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    Your advice here is probably sensible, although I have found a need to use shorter development times with Jobo processing. However, direct comparisons are difficult with hand agitation or other methods as the physical procedure of the process varies.


    Tom
     
  6. RalphLambrecht

    RalphLambrecht Subscriber

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    Local conditions are always different enough to warrant a proper film test. Trial and error takes longer and delivers less accurate results.
     
  7. Sirius Glass

    Sirius Glass Subscriber

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    ^^^ What he said ^^^
     
  8. OMU

    OMU Member

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    Hi;
    I have the same experience.
    I have tested dev times for HP5 and FP4 with densitometers and my times are practically the same as the Ilford’s recommendations.
     
  9. Lee L

    Lee L Member

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    Here's the most recent word I've seen from Jobo on converting from small tank inversion times, from the Jobo Quarterly, 2nd Quarter, 1998. I think this should fall under 'fair use'.

     
    Last edited by a moderator: Sep 28, 2010
  10. RalphLambrecht

    RalphLambrecht Subscriber

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    Thanks for posting this, Lee.
     
  11. Lee L

    Lee L Member

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    I looked around for the current home of the Jobo Quarterlies. The internet archives for them have moved and occasionally disappeared over the years. They have been at the following location for the last couple of years:

    http://www.jobo.com/jobo_service_analog/jq/

    which is a menu driven front end to finding articles and issues.

    If you have a Jobo, they are well worth reading, and have good stuff for general photo purposes as well.

    Lee
     
  12. fotch

    fotch Member

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    Should be 1998. Link http://www.jobo.com/jobo_service_analog/jq/jq9802.htm
     
  13. Lee L

    Lee L Member

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  14. dng88

    dng88 Member

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    I am reading Photo Engineer about another reason to do presoak, especially for color, is due to the change in temp. when the dev. solution hit the film. Heating the tube would not work. The water here is 80F+ sometimes. Not yet start my test but would try. Just wonder whether Xtol would need this after all.