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Thread: Divided Procat HD

  1. #41

    Join Date
    Sep 2003
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    South Carolina
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    Re: Divided Procat HD

    Quote Originally Posted by Ken Lee View Post
    Walter: Congratulations and thanks ! Your patience and persistence are helping us all.

    Sandy: What does the wetting agent do, if it is applied in solution A ? Does it promote absorption of solution A into the film emulsion ?

    If that is the case, would a longer pre-soak accomplish the same thing ?

    Given that films have dyes which are removed in pre-soak, would it be helpful to perform more than one pre-soak, or to perform pre-soak with a large volume of water ?

    What is the difference between a wetting agent (which breaks up surface tension in water), and something that changes the pH of the water ?

    Walter - Are you sure the streaking in the first photo, isn't really a rare 'double twister" in the sky ? Also, could you share with us the Zone values for your photo ? I'm very interested in how things play out doing landscape photography. Did you use a filter for separation in the clouds ?
    Walter,

    Ken,

    So far as I know the wetting agent does not promote absorption of Solution A into the emulsion. Rather, it releases the surface tension and allows Solution A to spread over the surface of the negative instead of pooling or streaking in one area as some liquids tend to do after they drain. If Solution A drains in streaks this could result in uneven development because Solution B would come into contact with uneven amounts of Solution A.

    And no, I don't believe a longer pre-soak would accomplish the same thing as the wetting agent.

    Sandy
    http://www.sandykingphotography.com/
    For discussion and information about carbon transfer please visit the carbon group at Yahoo.
    https://groups.yahoo.com/neo/groups/...nTransfer/info

  2. #42

    Join Date
    Jan 2007
    Location
    western ma
    Posts
    34

    Re: Divided Procat HD

    Ken

    This is not a double twister, the negatives were exposed within 10 seconds of each other. I flipped the first negative on the JOBO reel on purpose just to see the difference. The shadows to the left of the shed were placed on zone III the brightest cloud was placed on XII I used no filter.

    Walter

  3. #43

    Join Date
    Sep 2003
    Location
    Massachusetts USA
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    7,834

    Re: Divided Procat HD

    Sorry, I was joing about a double twister

  4. #44
    Greg Greg Blank's Avatar
    Join Date
    Mar 2009
    Location
    Planet Earth
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    1,084

    Re: Divided Procat HD

    Those steaks are where the negative contacted or nearly contacted the ribs of the drum. Consequentaly the chemicals surged at the ribs leaving the steaks.


    Quote Originally Posted by walterb View Post
    Sandy
    Another test with my divided pyro. Changed the dilution to 1:20 both A & B 600 ml ea
    added 2ml of Kodak photo flo to the A. Developed both negatives at the same time 5 min ea., 1 min distilled water stop, 5 min tf4 fixer, 20 minutes wash distilled water.

    I loaded one negative with the emulsion side to the outside on the JOBO reel, the other one was loaded correctly with the emulsion to the inside. The one loaded incorrectly shows streaking, the one loaded correctly show no blotches or streaking. I know it is only one negative but it appears that the photo flo has corrected the problem. This is the first time for me at least with no blotches.

    Walter

  5. #45

    Re: Divided Procat HD

    Quote Originally Posted by Greg Blank View Post
    Those steaks are where the negative contacted or nearly contacted the ribs of the drum. Consequentaly the chemicals surged at the ribs leaving the steaks.
    Likely correct, IMO.
    I have no love for the 2500 series sheet film holder.

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