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  1. #1

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    [HELP] Efke IR 820 and d-23... what is the "FORMULA"?

    Dear "analogic" friends,

    Yesterday I bought an Efke IR 820 for my Pentax 6x7. For infrared photos I use an 600nm filter (and not a "classic" 720nm like Hoya IR72).

    So, according to the datasheet I have to expose my Efke to 6 or 9 ISO. (With the 720nm filter, the recommended exposure is at 3 ISO).

    I like develop my film with the Kodak D-23. But... with this Efke, I haven't found information about times and/or diluitions.

    Please.... can you help a "young" photographer?

    Thanks,

    Enrico.

    P.S.
    Apologies for my English.

  2. #2

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    Use the same time given for Kodak D-76 or Ilford ID-11.

  3. #3
    MDR
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    Enrico I'd add a minute to the D76 times, 1 - 2 minutes longer dev. times than D76 seems to be the norm with D23.

    Buona fortuna
    Dominik

  4. #4

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    Quote Originally Posted by MDR View Post
    Enrico I'd add a minute to the D76 times, 1 - 2 minutes longer dev. times than D76 seems to be the norm with D23.

    Buona fortuna
    Dominik
    Grazie Dominik!

    So, for D76 stock, the time is 8/9 minutes, therefore The time of D-23 is 10/11 minutes. (stock diluition).

    Any suggestion for a dilution 1+3? maybe 20 minutes or more?

    Thanks!

  5. #5
    MDR
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    Enrico I found this info on using Efke 820c with D23 1+3 Dilution online just follow the link http://filmdev.org/recipe/show/5976

    Dominik



 

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