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  1. #11

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    [quote="David A. Goldfarb"]Extending development time usually only increases contrast by increasing the highlight density without improving shadow detail.


    With one exception. The use of very dilute developers in conjunction with minimal agitation procedures can result in a significant increase in shadow detail without increasing contrast in the highlights. On Michael and Paula's AZO forum there has been some recent discussion of the use of Pyrocat-HD with stand, semi-stand and minimal agitation procedures. I was intrigued by the reports and carried out some tests myself this week using what I call extreme minimal agitation. What I found was that this type of development results in a rather dramatic increase in effective film speed. For example, with rotary processing my normal EI for FP4+ when the negative is developed to a CI of 0.85 (for palladium printing) is about 125. With extreme minimal agitation procedures the EI increases to about 225, at the same CI.

    Water bath development may provide an equivalent increase in EI, but I do not find that it gives any advantage over the use of a dilute developer and minimal agitation procedures.

    Another interesting result from the use of extreme agitation procedures with dilute developers is that you get exaggerated adjacency effects and this can greatly enhance apparent sharpness.

    Sandy


    [/i]

  2. #12
    Eric Rose's Avatar
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    What is the address for this AZO forum??
    www.ericrose.com
    yourbaddog.com

    "civility is not a sign of weakness" JFK

    "The Dude abides" - the Dude

  3. #13

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    Quote Originally Posted by EricR
    What is the address for this AZO forum??
    http://www.michaelandpaula.com/mp/index_skip.html



    Sandy

  4. #14
    Paddy's Avatar
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    Aside from utilizing some of the aforementioned "stand developing" techniques/developers, shadow detail is obtained primarily through the exposure, not development. So for determining my effective E.I. with a given film, I always want to know if I've acheived a threshold density in Zone I of at least .10 above FB+F. If I have then I'll also know what the E.I. is for that film. Truth be told, my "normal" E.I. for FP4+ is 25, ditto for J&C Classic 200, and 100-160 for HP5+. I've simply accepted the fact that when the Winter Olympics come to town in 2010, I won't be doing anything even remotely motor driven. ;-)
    "If I'm a rebel sanctioned by society, encouraged by my parents, and cheered on by Hallmark, what is left to rebel against?"
    Hal Niedzviecki

  5. #15
    Flotsam's Avatar
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    I'm on the third roll testing this stuff (JandC 200). Like you, I think that I'm going to wind up around EI 125 or 160. My developing, though I've cut it quite a bit, is still over the top, pushing the highlights way too high. It's also pretty grainy but I hope that nailing down my exposure and development will improve that.
    That is called grain. It is supposed to be there.
    =Neal W.=

  6. #16
    Flotsam's Avatar
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    B.T.W. I love "Nicole". A wonderful portrait of a lovely model. A bit bored, a bit defiant, but an open expression, full of life and personality.
    Weren't we all at that age?
    That is called grain. It is supposed to be there.
    =Neal W.=

  7. #17
    Ed Sukach's Avatar
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    Quote Originally Posted by jdef
    Thanks Neal. She's a friend of my daughter's, and a very unique girl. She's enlisted in the marines, and a little apprehensive about her future, I think.
    Hah! Small world!

    My grand daughter-in-law just enlisted in the Marines.

    I think she is in for an instant "reality check".
    Carpe erratum!!

    Ed Sukach, FFP.

  8. #18

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    I just developed my first negs with D76 with .4 gr/liter potassium bromide as additive. The idea is that the p b gives lower base fog and a corresponding increase in shadow contrast. I haven't printed yet, but there's no question the B/F is lower than negs developed yesterday without the additive, so I expect it will make at least a subtle difference.

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