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  1. #1
    vedmak's Avatar
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    where to get times for Jobo B&W development

    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. #2
    Alistair Wait's Avatar
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    I am using one and taking 15% off the times given in MDC. Seems to be working fine.

  3. #3
    Alistair Wait's Avatar
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    MDC gives the same advice in their FAQ's here
    http://www.digitaltruth.com/devchart.php?doc=faq

  4. #4
    Sirius Glass's Avatar
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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
    Warning!! Handling a Hasselblad can be harmful to your financial well being!

    Nothing beats a great piece of glass!

    I leave the digital work for the urologists and proctologists.

  5. #5

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    Quote Originally Posted by Sirius Glass View Post
    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
    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. #6
    RalphLambrecht's Avatar
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    Quote Originally Posted by vedmak View Post
    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?
    Local conditions are always different enough to warrant a proper film test. Trial and error takes longer and delivers less accurate results.
    Regards

    Ralph W. Lambrecht
    www.darkroomagic.comrorrlambrec@ymail.com[/URL]
    www.waybeyondmonochrome.com

  7. #7
    Sirius Glass's Avatar
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    ^^^ What he said ^^^
    Warning!! Handling a Hasselblad can be harmful to your financial well being!

    Nothing beats a great piece of glass!

    I leave the digital work for the urologists and proctologists.

  8. #8
    OMU
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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. #9
    Lee L's Avatar
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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'.

    To Soak or Not to Presoak

    By Ken Owen

    Recently, on the internet, we have seen questions regarding black and white (BW) rotary processing, particularly in regard to Kodak’s Xtol developer. Participants in the internet newsgroup rec.photo.darkroom are quick to point out that we at JOBO recommend that all conventional BW films should be processed using a 5 minute presoak, except for Xtol, but there seems to be a fair amount of confusion regarding the reasoning behind the presence or absence of a presoak.

    The story goes all the way back to the earliest days of JOBO here in the USA, about 16 years ago. At that time we wanted to be able to provide a simple starting point for BW film processing. Yet, we knew that the constant agitation of the JOBO rotary processors was going to increase the contrast on any films processed in them. We began exhaustive testing in search of the elusive magic factor which would allow us to say "To process BW films, simply multiply your developing time by X, and your rotary processing will work perfectly."

    When we found a factor on one film that worked well for a single developer, we then tried that film in other developers. We quickly discovered that the factor did not translate to many of the other developers. So we reversed our approach and tried different films in the same developer. Again, we quickly discovered that one factor would not work on many different films in the same developer.

    Then after a year or two of frustration, one of the technical staff at JOBO Germany told us to try a five minute presoak in water. So we tested a wide variety of films and developers and the vast majority worked well simply following the normal hand-inversion instructions from the developer manufacturer, and preceding it with this five minute presoak. While some of the combinations of films and developers needed minor adjusting, nearly all the tested materials came within 5% of being right on target for delivering excellent results. We also tested shorter presoak times and found they did not work well at all.

    So JOBO USA began recommending five minute presoaks for all BW developer and film combinations. Then about 1988 Kodak came out with T-Max films, and for the first time in our memory, a film manufacturer had included rotary developing instructions. Basically they had followed the same instructions we had discovered, and there was no need for any changes.

    Then about three or four years ago, Kodak introduced Xtol developer. This time they not only had rotary processing instructions, they also had a whole instruction sheet dedicated just to rotary processing and for the first time in recent Kodak history, they gave instructions for other brands of film, as well as their own. But most importantly for JOBO, they indicated that all their developing times were for use without presoak. THIS is what caused all the discussion on the internet newsgroups. Why should Kodak advocate no presoak when JOBO advocates a presoak?

    Go back to the history of the story, and the answer is clear. JOBO was looking for a SIMPLE way to get customers successful in their processing. The presoak provided that simple "common denominator" that enabled us to tell customers, "Presoak for five minutes then process normally."

    What Kodak did was an enormous amount of testing, and published the results. Neither method is right or wrong. They both work well. If you are currently presoaking your film and getting the results you like, then keep on doing it. If you are starting without a presoak and you like the results, then keep on doing it. As I’ve said before, photography is not a pure science- it’s really alchemy. Enjoy it.

    Note: JOBO does not ordinarily recommend a presoak for color films since it may cause a slight color shift.
    Last edited by Lee L; 09-28-2010 at 02:30 PM. Click to view previous post history. Reason: typo: 1988 corrected to 1998

  10. #10
    RalphLambrecht's Avatar
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    Quote Originally Posted by Lee L View Post
    Here's the most recent word I've seen from Jobo on converting from small tank inversion times, from the Jobo Quarterly, 2nd Quarter, 1988. I think this should fall under 'fair use'.
    Thanks for posting this, Lee.
    Regards

    Ralph W. Lambrecht
    www.darkroomagic.comrorrlambrec@ymail.com[/URL]
    www.waybeyondmonochrome.com

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