Rodinal dilutions

Discussion in 'Darkroom Developing and Printing' started by David Nebenzahl, Jul 31, 2003.

  1. Could you (or someone else) reiterate for my benefit the qualitative
    differences between the various dilutions (1:25, 1:50, 1:100) of Rodinal? I
    just processed HP5 at 1:50 and got what look at first blush like excellent
    results. Why did I use 1:100? I dunno ... thought it might give finer grain,
    or is that higher acutance?

    To those of us not whiskered and experienced with this developer, these
    dilutions seem like some kind of black-magic incantation. For instance, even
    the Rodinal box gives development times at 1:25 and 1:50, yet it doesn't say a
    single word about why you'd want to use one or the other. I guess you just
    need to be well-versed in this kind of mumbo-jumbo.

    --
    We are receiving alerts about a worm that is spreading around the Internet
    contained in a .zip archive file. What is surprising to security analysts
    is that this worm is spreading at all since it cannot execute without user
    intervention. Security analysts believe the rapid spread indicates that
    recipients are still opening email attachments even after they have been
    warned many times that it is unsafe to do so.

    - Description of the "Sobig.E" worm, ca. June 2003
     
    David Nebenzahl, Jul 31, 2003
    #1
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  2. David Nebenzahl

    Jeff Novick Guest

    I have used all the above dilutions and can tell you something about the way
    the developer performs. In general, the higher the dilution, the sharper the
    negs, more acutance. And, the higher the dilution of Rodinal, the less
    grain, not more. Exactly the opposite of D-76 at higher dilutions. The lower
    the dilution, the more contrast. At 1+100, you can generally control the
    highlights because of the compensation effect. 1+25 will give you snappier
    negs, but, 1+100 will give you beautiful ones. I don't recommend Rodinal
    with fast 35mm films. Too much grain for my taste. Great with larger format
    films.
     
    Jeff Novick, Aug 1, 2003
    #2
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