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  1. #21
    Bill Burk's Avatar
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    Quote Originally Posted by Stephen Benskin View Post
    Here's a graph of it from Photographic Materials and Processes.
    I was under the impression that leaf shutters accommodated this by "not" being as fast as their highest speeds say they are.

    For example the 200th of a second speed setting might in actuality be 160th of a second real time to allow the sum of the bell-curve opening and closing over the full aperture... to be effectively 200th of a second.

  2. #22
    Stephen Benskin's Avatar
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    Quote Originally Posted by Bill Burk View Post
    I was under the impression that leaf shutters accommodated this by "not" being as fast as their highest speeds say they are.

    For example the 200th of a second speed setting might in actuality be 160th of a second real time to allow the sum of the bell-curve opening and closing over the full aperture... to be effectively 200th of a second.
    That would be wonderful except it takes longer to expose the aperture if it is set at 5.6 than at 22. There's no way to fully compensate.

  3. #23
    RalphLambrecht's Avatar
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    i find it esier to printwhen y negatives are a bit on the soft side (n-1)and i compensate with a grade-3 paper as 'normal'
    Regards

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

  4. #24
    Bill Burk's Avatar
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    Quote Originally Posted by RalphLambrecht View Post
    i find it esier to printwhen y negatives are a bit on the soft side (n-1)and i compensate with a grade-3 paper as 'normal'
    I'm about to find out, just started developing a "box" of N+2 negatives and I'm only developing them to N+1... So they are destined for Grade 3.

  5. #25
    Rafal Lukawiecki's Avatar
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    Quick update. My densitometer is on its way, and Stouffers arrived today. I have also ordered a lab calibrated thermometer, as I really would love to know what is 20˚C, precisely. I realise that it does not matter that much, as long as I settled on some repeatably fixed temperature X within a shooting range of 20/68, but this gives me a chance to get one other variable a bit more fixed. So my testing is now delayed until week of 9th July. Will catch up on printing in the meantime.
    Rafal Lukawiecki
    See rafal.net | Read rafal.net/articles

  6. #26

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    Several years ago I invested in a calibrated certified thermometer and I consider it a useful investment. I've been known to break or lose a thermometer here and there so I don't actually use the expensive calibrated one. I just use it to calibrate inexpensive thermometers and then use those.

  7. #27
    Rafal Lukawiecki's Avatar
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    That's my plan precisely, to use it only for calibrating day-to-day thermometers. Thanks for chiming in, I don't feel too alone in this obsession, anymore.
    Rafal Lukawiecki
    See rafal.net | Read rafal.net/articles

  8. #28
    gmfotografie's Avatar
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    can anybody tell me how such a slide duplicator works with a Hassi 501cm and an 80mm ?!
    Its not possible or? I need a closeup lens

    best

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