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Thread: Chemistry dilution

  1. #1

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    Chemistry dilution

    Helllo,

    I would like to try the development of 6 120 rolls -ilford hp5- into a Jobo drum with 570ml max capacity.

    I thought about rodinal but I do not have it clear enough about the possible dilution.

    Someone has ideas, dilution or other developers about?

    Thank you,

  2. #2

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    Re: Chemistry dilution

    You MUST understand the relationship between "exhaustion" and high dilutions otherwise you will become "experienced". However, you can "get away with it" by pouring in fresh highly diluted developer (after you've poured out the exhausted developer, of course) during the longer processing time. It gets to be like scating on thin ice though. Are these you mother-in-law's films? Perhaps a search on the "Cons of highly diluted developing in small tanks that hold many rolls" will disabuse yourself of the precariousness of such a path.

  3. #3

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    Re: Chemistry dilution

    Thanks for the answer.

    I think my english is too bad but anyway...I will try to formulate differently :

    Rodinal brochures said that concentraded product 500ml is enoufh for the developing of 50 films.
    Means that 10ml are enough for the development of a film.

    My question is :

    May I e.g put into a drum 6 120 rolls and 70ml -at least- of concentrates rodinal, the rest, till 570water and expect to have the right result?

    There is no question to regenerate till the exhaustion the solution there is that I have so much rolls to process and I try to make it short and efficient.

    Regards,


    AP

  4. #4

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    Re: Chemistry dilution

    Quote Originally Posted by pawl View Post
    Thanks for the answer.

    I think my english is too bad but anyway...I will try to formulate differently :

    Rodinal brochures said that concentraded product 500ml is enoufh for the developing of 50 films.
    Means that 10ml are enough for the development of a film.

    My question is :

    May I e.g put into a drum 6 120 rolls and 70ml -at least- of concentrates rodinal, the rest, till 570water and expect to have the right result?

    There is no question to regenerate till the exhaustion the solution there is that I have so much rolls to process and I try to make it short and efficient.

    Regards,


    AP
    For what you are planning another developer would be a better choice, because your dilution will be about 1:7; you may get blown highlights, and definately will not have any compensating effect. Additionally, unless you want large grain, other dev. are better suited to HP5, especially 120 format.
    Last edited by Ron Marshall; 2-Nov-2008 at 08:33.

  5. #5
    Moderator Ralph Barker's Avatar
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    Re: Chemistry dilution

    This is 120 film exposed in a rollfilm back in a 4x5 camera, right?

  6. #6

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    Re: Chemistry dilution

    No this is 120 film used with mf camera.

    I just try to find my way how optimise my developing equipment.

    I can introduce 6 120 films or 12 4x5 sheets but I have only 570ml capacity for the treatment into the jobo dedicated drums.

    I would like to optimise the operations I have not so much time and not dedicated place.
    So the best way is mass production.
    I don't care if the developer is rodinal or something else, I just try to find a developer with the right dilution which doesn't exceed the 570ml and have enough activity for the whole surface of the films and acceptable time.
    Thanks,

    Regards,

    AP

  7. #7

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    Re: Chemistry dilution

    Use XTOL, D76 or DDX.

  8. #8
    ic-racer's Avatar
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    Re: Chemistry dilution

    Quote Originally Posted by pawl View Post
    Helllo,

    I would like to try the development of 6 120 rolls -ilford hp5- into a Jobo drum with 570ml max capacity.

    I thought about rodinal but I do not have it clear enough about the possible dilution.

    Someone has ideas, dilution or other developers about?

    Thank you,
    Here is the way I process film with dilute Rodinal in a Jobo: http://www.largeformatphotography.in...hlight=rodinal

  9. #9
    All metric sizes to 24x30 Ole Tjugen's Avatar
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    Re: Chemistry dilution

    I can't find any JOBO tank that takes 4x5", with a maximum capacity of 570ml - are you sure that's not the minimum?

    If you tell us which tank you use, it's a bit easier to answer.

  10. #10

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    Re: Chemistry dilution

    Thanks for the link ic-racer and about the drums first 1520+1530 for the mf capacity is 570ml which the max for cpe-2 machines.

    The lf drum is 5-2551, indeed capacity is a bit higher 640ml.

    So let's tell 600ml average volume and developer for 6 120 films and 12 4x5 sheets.
    that's the question!!!

    Regards, and thanks for the answers,

    AP

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