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  1. #11

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    Quote Originally Posted by DREW WILEY View Post
    Sounds like a myth to me. #76 produces more of a sag in the curve than HC-110, which is capable of a
    perfectly straight line in films engineered with that characteristic.
    Drew - I use HC110 Dil. B at 68F with Tmax100 and can't get away from a sag in the mid range of the curve. What do you have to do to get the curve to run straight?

    Gord

  2. #12

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    Thanks, will probably start off with HC110

  3. #13
    Bill Burk's Avatar
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    CPorter,

    You've got HC-110 curves, as I recall... they DO have a bit of an up-sweep.

  4. #14
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    Quote Originally Posted by Bill Burk View Post
    CPorter,

    You've got HC-110 curves, as I recall... they DO have a bit of an up-sweep.
    They do, both for TMX and TXP, as opposed to very straight-lined with XTOL and D-76 1:1.

  5. #15
    Bill Burk's Avatar
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    I believe this up-swept curve would be beneficial to portraiture, where the customer's facial tones need the best separation...

    But it would drive Ansel Adams nuts trying to hold highlights in check - thus leading him to conclude the diffusion enlarger is the only way to go...

  6. #16
    Rafal Lukawiecki's Avatar
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    Quote Originally Posted by Bill Burk View Post
    I believe this up-swept curve would be beneficial to portraiture, where the customer's facial tones need the best separation...
    Bill, out of interst, would this add a bit more "reality" to a portrait, making wrinkles etc stand out? Or would the upsweep affect eyes the most?
    Rafal Lukawiecki
    See rafal.net | Read rafal.net/articles

  7. #17
    Bill Burk's Avatar
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    Yes, I think it would give you more details and information in the area where the viewer is looking. My curves in D-76 tend to be relatively straight-line until above 1.2 density, so the effect is "above Zone VII" for me. In my case, I tend to have my high-density step wedge values towards the outside of the film, where agitation effects provide more development action. So I ignore it.

    Quickly getting out of my league because I am a nature/landscape photographer - and the portraits I do are typically candid/available light.

    In another thread, an upswept curve is viewed as a defect.

  8. #18
    Rafal Lukawiecki's Avatar
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    Thank you, Bill. It is very helpful for me to learn how different aspects of a curve's shape are used by photographers in their practice. As you know, I am a newcomer to graphing characteristic curves, and I am still surprised by the relative meaning of their nuances in the pictorial domain.
    Rafal Lukawiecki
    See rafal.net | Read rafal.net/articles

  9. #19
    Bill Burk's Avatar
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    Quote Originally Posted by Rafal Lukawiecki View Post
    Thank you, Bill. It is very helpful for me to learn how different aspects of a curve's shape are used by photographers in their practice. As you know, I am a newcomer to graphing characteristic curves, and I am still surprised by the relative meaning of their nuances in the pictorial domain.
    And I think the people who really know this the best... know it by feel.

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