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  1. #21
    Christopher Walrath's Avatar
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    There's one way around all this. If one would like to reduce intermittency, but not to its entirety, then follow Matt's advice. If you make a test strip at f/8 exposing 32-16-8-4-2-1-1. You could expose at f/16 for 128-64-32-16-8-4-4. At the longer times the amount of affectation on the halides would be the same, however much less noticeable.

    Given that this would be a stupidly long exposure time to make a test print, don't do it.

    Ralph is pointing out information to get the OP down the correct path to learning about his topic if questioning.
    Thank you.
    CWalrath
    APUG BLIND PRINT EXCHANGE
    DE Darkroom

    "Wubba, wubba, wubba. Bing, bang, bong. Yuck, yuck, yuck and a fiddle-dee-dee." - The Yeti

  2. #22
    Nicholas Lindan's Avatar
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    Quote Originally Posted by RalphLambrecht View Post
    Cut me some slack here. I referenced that article for the OP so he could read up on the intermittency effect, but I never claimed that this effect has anything to do with lamp warm-up. They are totally unrelated.
    Didn't mean to imply that you said it. It was just in the reference you cited - where the author seems to be quite confused as what he talks about is lamp warm-up though he calls it intermittency.

    There are, as you state, many, many factors to account for. A stabilized LED source can be timed very accurately and would let one explore the issue in more depth. But frankly, if adding 50mSec to the exposure time makes the problem go away that's about all the effort that needs to expended at this time.
    DARKROOM AUTOMATION
    f-Stop Timers - Enlarging Meters
    http://www.darkroomautomation.com/da-main.htm

  3. #23
    RalphLambrecht's Avatar
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    Quote Originally Posted by Nicholas Lindan View Post
    ... But frankly, if adding 50mSec to the exposure time makes the problem go away that's about all the effort that needs to expended at this time.
    Nicholas

    Now you've got me going. I'm currently setting up my equipment to measure the light ramp-up/down of my Durst L1200 halogen bulb.

    There is no stopping me now!
    Regards

    Ralph W. Lambrecht
    www.darkroomagic.comrorrlambrec@ymail.com[/URL]
    www.waybeyondmonochrome.com

  4. #24

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    So 2.05 + 2.05 = 4.
    Kirk

    For up from the ashes, up from the ashes, grow the roses of success!

  5. #25
    Nicholas Lindan's Avatar
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    Quote Originally Posted by Kirk Keyes View Post
    So 2.05 + 2.05 = 4.
    For sufficiently large values of 4.
    DARKROOM AUTOMATION
    f-Stop Timers - Enlarging Meters
    http://www.darkroomautomation.com/da-main.htm

  6. #26
    ruilourosa's Avatar
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    people, please calm down, ansel used a metronomer. do some test strips. experience is useful. i never found enlarger delays very problematic, keep times a bit longer than 20 secs. keep it simple you will need the energy in your legs and your mind not to give up printing after 6 hours in the lab
    vive la resistance!

  7. #27
    RalphLambrecht's Avatar
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    Quote Originally Posted by ruilourosa View Post
    people, please calm down, ansel used a metronomer. do some test strips. experience is useful. i never found enlarger delays very problematic, keep times a bit longer than 20 secs. keep it simple you will need the energy in your legs and your mind not to give up printing after 6 hours in the lab
    Don't worry; we're calm. Nevertheless, timer delay can be a problem when doing test strips ala Fred Picker.
    Regards

    Ralph W. Lambrecht
    www.darkroomagic.comrorrlambrec@ymail.com[/URL]
    www.waybeyondmonochrome.com

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