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  1. #11

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    I have done careful comparisons with that combo and 68 gives finer grain than 75, very slightly.

    There is a chart on Ilfords web site that gives temp compensation. It works well for me.

    I use Filtered Chicago water, Focomat ic, and the Ilford times are perfect.

  2. #12
    Ian Grant's Avatar
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    Quote Originally Posted by Urmonas View Post
    Developing at 24C will give more grain than developing at 20C. I would go for the ice in the tub method. I have done this for tap water temperatures of 30+ with good success. You only need to keep it constant for the development, after that if it slowly drifts up it is not an issue.
    There's absolutely no difference in the amount of grain at 18, 20, 22, 24 or 27° C provided you keep the temperature stable for the whole process cycle including washing.

    The myth of grain being caused by temperature is because older films suffer from surface artefacts also known as micro reticulation with temperature changes between steps. Some films are more prone than others and choice of developer has an impact. It's why German Rodinal users prefer to work at 18°C, the hydroxide in modern Rodinal causes additional softening of the emulasion.

    Ian

  3. #13
    Steve Smith's Avatar
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    Quote Originally Posted by ISO400 View Post
    24ºC would be like 7.5 minutes in 1+1
    It wouldn't be like 7.5 minutes, it actually would be 7.5 minutes according to Ilford's chart..


    Steve.
    "People who say things won't work are a dime a dozen. People who figure out how to make things work are worth a fortune" - Dave Rat.

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