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  1. #11
    Ole
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    Quote Originally Posted by jjstafford
    I am not comparing Efke 25 with Efke KB or PL 100, but Efke 25 with (for example) Tri-X 320.

    I mean what I wrote. Efke 25 has a greater sensitivity to green and red (compared to blue) than Tri-X 320 film. Can you show me different information? Have you ever tried to develop Efke 25 under red safelight?
    http://www.efkefilm.com/

    http://www.jandcphotography.com/efkedata.htm

    And my own experience, and all my photographic literature all the way back to Willi Beutler.
    -- Ole Tjugen, Luddite Elitist
    Norway

  2. #12

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    Quote Originally Posted by Ole
    http://www.efkefilm.com/

    http://www.jandcphotography.com/efkedata.htm

    And my own experience, and all my photographic literature all the way back to Willi Beutler.
    You are avoiding the point. It means nothing unless you put the data side-by-side with Tri-X 320 data.

    Your experience? You said that Efke 25 is red-blind, and I asked if you have ever developed it under red safelight. You clearly have not or you wouldn't dare say that.

    I wasn't born yesterday.

  3. #13

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    http://www.efkefilm.com/KB25spek.jpg
    http://www.kodak.com/global/en/profe...002_0360ac.gif

    Spectral curves for Efke 25 and Tri-x.
    Efke 25 is not "red-blind" but is not as sensitive for red as Tri-x. It is certainly not MORE sensitive to red.

  4. #14

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    eatfrog:

    I appreciate the possible correction, but Efke's chart does not give the vertical scale we both need to make our points. I could point to relative comparisons, but we just plain need the correct Efke data.

  5. #15
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    As long as were into data--

    I read the statement that Super-XX was the last "thick" emulsion film produced. All others after it were the "new" thin coating philosophy. Does anyone using Super-XX have any data that compares the coating thickness of it to modern films?

  6. #16
    Ole
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    Quote Originally Posted by jjstafford
    Your experience? You said that Efke 25 is red-blind, and I asked if you have ever developed it under red safelight. You clearly have not or you wouldn't dare say that.

    I wasn't born yesterday.
    I develop all my sheet film by inspection. For PL25 I use a red safelight, for all others a weak green one.

    I have also used R50 for portraits, and seen red lips come out as black.

    The vertical scale on the sensitivity charts is irrelevant - compare 25 and 50 with the 100! The sensitivity of 25 and 50 drop to zero at about 630nm, the KB100 goes to about 680nm, PL100 a little less but with higher sensitivity around 640.

    Try using EFKE 25 withh a dark red filter. It should be easy to see if it comes out darker than expected from "standard" filter factors, or entirely blank.
    -- Ole Tjugen, Luddite Elitist
    Norway

  7. #17

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    Quote Originally Posted by Ole
    I develop all
    The vertical scale on the sensitivity charts is irrelevant - compare 25 and 50 with the 100! .
    For gosh sake, how many times are you going to try change the issue? The comparison was 'old' style (efke 25) compared to Tri-X! The two charts given in that case were different - Kokak had vertical metrics and Efke had none!

  8. #18
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    Quote Originally Posted by jjstafford Yesterday 03:52 PM
    Your experience? You said that Efke 25 is red-blind, and I asked if you have ever developed it under red safelight. You clearly have not or you wouldn't dare say that.
    Quote Originally Posted by ole Today 08:31 AM
    I develop all my sheet film by inspection. For PL25 I use a red safelight, for all others a weak green one.
    Quote Originally Posted by jjstafford Today 10:55 AM
    For gosh sake, how many times are you going to try change the issue?
    Hmmmmm
    Film is cheap. Opportunities are priceless.

  9. #19
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    My dads bigger than your dad?

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    Quote Originally Posted by snaggs
    My dads bigger than your dad?
    Happy Father's Day, snaggs! (Chances are I'm older than your Dad. No fights!)

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