JOBO ATL-1500 Developer Dilutions

Discussion in 'Darkroom Equipment' started by Renato Tonelli, Dec 2, 2009.

  1. Renato Tonelli

    Renato Tonelli Subscriber

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    Here I am making a nuisance of myself yet again...


    1) I use X-TOL 1:1 and Microdol-X 1:3 for 90% of my processing.

    2) The Kodak literature specifies 100ml of stock solution per 80sq.in. of film (one 35mm roll).

    3) The Jobo tanks (2500 series) for the ATL-1500 hold a maximum of 660ml for five reels.

    4) At 1:1, the total volume would be 1000ml; at 1:3 it would be 2 liters!

    So, it's impossible to process 5 reels at these dilutions, unless... and here, finally are my questions:

    Is it possible to lessen the stock solution and lengthen the developing time?

    Is there a formula for figuring out how much to lengthen the developing time?

    Thank you in advance for your help.
     
  2. MikeSeb

    MikeSeb Member

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    You can experiment to see whether you can get by with less stock solution per roll. I have generally gone with Kodak's recommendations, even though they are likely conservative, because I hate ruining film I've been at pains to purchase and shoot by scrimping on developer.

    At 600ml per tank that's 300mL stock solution, or enough for about 3 rolls.
     
  3. ic-racer

    ic-racer Member

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  4. Martin Aislabie

    Martin Aislabie Subscriber

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    Kodak recommends starting with at least 100ml of XTOL stock for each film but the replenishment rate is only 70ml per film (I don’t understand why these numbers would be different – but may be someone else might be able to).

    Therefore it seems reasonable enough to assume you only need 70ml of chemistry to process one film

    With a 660ml bottle capacity it would seem you have 2 choices:-

    1) Use 350 ml (5 x 70ml) of XTol + 310ml of water (not quite 1+1)

    or

    2) Use 330ml of XTol + 330ml of Water & use marginally less dev than Kodak recommend

    Either way the numbers are not too far outside the normal operating range to be at least in with a chance of succeeding

    Either way you are going to have to run some tests to see what Dev + Water + Time works for you

    Have fun

    Martin