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  1. #51
    Steve Smith's Avatar
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    Don't worry. I'm going to get the sun re-calibrated on Thursday.


    Steve,
    "People who say things won't work are a dime a dozen. People who figure out how to make things work are worth a fortune" - Dave Rat.

  2. #52
    Ralph Javins's Avatar
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    Good morning, Steve Smith;

    Thank you for the information that the sun will be recalibrated this coming Thursday. I was beginning to worry about that. After all, the Johnson Curve was done back in 1948, and that data is at least 64 years old now.

    And all of this time I have been using the "Sunny 16 Rule" without any thought at all to the accuracy of the spectral intensity of the light source.

    Actually, the main thing that has been providing problems out here in Latte Land is the correction factor to apply as a function of the varying transmission characteristics of the different types of di-hydrogen oxide units floating in the air above us almost all of the time.
    Enjoy;

    Ralph Javins, Latte Land, Washington

    When they ask you; "How many Mega Pixels you got in your camera?"
    just tell them; "I use activated silver bromide crystals tor my image storage media."

  3. #53
    RalphLambrecht's Avatar
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    ithought thst's done every sunday.
    Regards

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

  4. #54
    Alan Klein's Avatar
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    The Sunny 16 rule is for the sun when it's in between 10am-2pm I believe.

  5. #55

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    the sunny 16 rule is just a rule of thumb and, like alan says, really only for 10 am to 2 pm on summer days -- and your experience here in the Rockies also makes sense -- we're about a mile up here, the air is thinner so there's less light lost to the air -- and here in Utah I usually allow an f-stop to the rule because the thinner air means shadows are a bit darker/contrasty because there's less air to reflect light into the shadow areas.

    Incident meter is your friend in all cases. Next best tool the human eyeball and the ability to bracket.

  6. #56
    RalphLambrecht's Avatar
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    no, it's due to the climate change
    Regards

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

  7. #57
    Steve Smith's Avatar
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    I sometimes use a Johnson's Exposure Disc. It takes the time, date, scene and weather into account and is surprisingly accurate.


    Steve.
    "People who say things won't work are a dime a dozen. People who figure out how to make things work are worth a fortune" - Dave Rat.

  8. #58
    RalphLambrecht's Avatar
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    where can this disc be had?
    Regards

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

  9. #59
    RalphLambrecht's Avatar
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    rules are here to break them, and the ones who do end up on apug to ask for help.
    Regards

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

  10. #60

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    Quote Originally Posted by RalphLambrecht View Post
    rules are here to break them, and the ones who do end up on apug to ask for help.
    Nice one. The next Way Beyond Monochrome edition should include a philosophical section for such sayings

    pentaxuser



 

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