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Thread: Exposure compensation for small apertures

  1. #41

    Join Date
    Jul 2008
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    3,236

    Re: Exposure compensation for small apertures

    Mechanical shutter are lesser accurate-precise by their innate workings. Thus was born the electronic shutter which improved this in various ways.

    The alternative method to achieve accurate-precise exposure of film is to used high quality electronic strobe-flash which is not nearly as dependent on shutter open-close times. Or why this was the overly preferred method of color transparency film exposure required for proper high quality color transparency image work back in the day. A properly calibrated and stable electronic flash system of lens aperture, film batch tested for actual film speed and all related produced consistent and reliable image results to 1/3 f-stop or better.


    Bernice


    Quote Originally Posted by Tin Can View Post
    I notice some want 1/3 stop accuracy with film aperture and shutter speed

    What is the ANSI spec?

    Maybe plus/minus 30 percent!

  2. #42
    Tin Can's Avatar
    Join Date
    Dec 2011
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    18,953

    Re: Exposure compensation for small apertures

    I know most disparage my 4 Paul C Buff Einsteins, they are what I could afford

    But I can precisely adjust them using my Sekonic L758 without rechecking IRL flash exposure

    I do like that
    Tin Can

  3. #43

    Join Date
    Dec 2005
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    Re: Exposure compensation for small apertures

    Quote Originally Posted by Tin Can View Post
    I notice some want 1/3 stop accuracy with film aperture and shutter speed

    What is the ANSI spec?

    Maybe plus/minus 30 percent!
    Randomly selected from random LF shutter service manuals (Graphex and Synchro Compur):

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    Attached Thumbnails Attached Thumbnails Capture3.JPG  

  4. #44
    Drew Wiley
    Join Date
    Sep 2008
    Location
    SF Bay area, CA
    Posts
    16,656

    Re: Exposure compensation for small apertures

    Little exposure errors can add up fast. For color transparency usage, even a third of a stop might be objectionable if one is working on the edge of contrast limits.

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