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Thread: Agitation when rotary processing

  1. #1
    God loves a tryer Scotty230358's Avatar
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    Agitation when rotary processing

    Having had marginal success using my HP combiplan and tray processing of 5x4 film I am now going to try rotary processing in my Jobo processor. I am going to be lazy and ask about agitation. Is two direction agitation better than single direction agitation.

    Many thanks in advance

    Adrian

  2. #2
    Film and Darkroom User
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    Re: Agitation when rotary processing

    My guess is that it must be as you are less lightly to experience bromide drag marks which can be caused through regular flow pattens. However, as a confirmed tray processor I cannot be sure.
    Regards
    Dave
    The PPC

  3. #3

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    Re: Agitation when rotary processing

    Although for many years bi-directional agitation was touted as the only way to get smooth negatives, many users report that single direction works well. I have mine reverse, but am considering single direction for the expert drums because they are a very heavy load on the motor.

  4. #4

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    Re: Agitation when rotary processing

    A Jobo tech. told me that reversing direction every 2.5 turns was optimal for the Expert Drums.

  5. #5
    Lachlan 717
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    Re: Agitation when rotary processing

    Reversing for me (non-Expert drums; non-expert operator!!)
    Lachlan.

    You miss 100% of the shots you never take. -- Wayne Gretzky

  6. #6
    Resident Heretic Bruce Watson's Avatar
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    Re: Agitation when rotary processing

    Quote Originally Posted by Scotty230358 View Post
    I am going to be lazy and ask about agitation. Is two direction agitation better than single direction agitation.
    I'll be lazy myself and just say "yes".

    Bruce Watson

  7. #7
    Scott Davis
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    Re: Agitation when rotary processing

    I've always run my Jobo in bi-directional mode with my Expert drums - honestly I never knew it was possible to run it in only one direction.

  8. #8

  9. #9

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    Re: Agitation when rotary processing

    I would say:

    ALWAYS reverse direction! I have been using it for over twenty years (E-6, C-41, B&W) with sucess. I see no reason to change it. As I said on a former post, I remember reading in some Jobo literature, back in Germany many years ago, that it was a MUST if you wanted to have consistent results...
    I have always followed that rule, with all kinds of drums, including various Expert drums for sheet film processing.
    Cheers,
    Rui
    AL-MOST-LY PHOTOGRAPHY

  10. #10
    Dave Karp
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    Re: Agitation when rotary processing

    I use the 3010 and 3005 drums on a Beseler base. I do not reverse them. So far, no problems.

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