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  1. #1

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    Delta 100 in HC-110 vs. DD-X

    This could get long...

    I happened to get a hold of a Jobo Multitronic timer/analyzer. One of the features of the is device is the ability to measure relative negative density, not a true densitometer, but a little better than nothing, right?

    I was testing testing Delta 100 with DD-X, since Ilford recommends it, and what I found is that I need to up-rate the EI to ~125 (interesting since most of what I've read is that most films require a reduction of film speed).

    Anyway, just for kicks I got out a recent test run of Delta 100 in HC-110 and found that I needed to down-rate the EI to ~64. I used the same equipment etc. that I used in the DD-X test.

    I've re-tested the DD-X to make sure that it wasn't an error on my part and I got the same result.

    Is this possible? Is DD-X so speed enhancing that it would cause me to have to up-rate the film to get the required densities? Is this Jobo analyzer wrong? Seems correct since I'm seeing a .3 change in the log D for each stop.

  2. #2
    johnnywalker's Avatar
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    Ilford recommends upping the EI with Delta 400 to 500 when using DD-X, and it is a developer recommended for pushing. I don't recall them recommending anything similar for Delta 100 however.
    If I had been present at the creation, I would have given some useful hints for the better arrangement of the Universe.
    Alfonso the Wise, 1221-1284

  3. #3
    Ken N's Avatar
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    This *would* explain why I like the underexposed bracket shots the best...

  4. #4

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    DDX is a microphen derived liquid dev, microphen or course being well known as a speed increasing dev.

  5. #5

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    Quote Originally Posted by Tom Stanworth
    DDX is a microphen derived liquid dev, microphen or course being well known as a speed increasing dev.
    Yes, DD-X and Microphen are both Phenidone/Hydroquinone based developers.

    DD-X uses Sodium Tetraborate buffered with Boric acid as the alkali. DD-X uses an organic solvent instead of water (Diethylene Glycol).
    Tom Hoskinson
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    Everything is analog - even digital :D



 

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