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Thread: Top-end digital concerns

  1. #141
    rvhalejr's Avatar
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    Re: Top-end digital concerns

    Quote Originally Posted by rvhalejr View Post
    Loupe Stands and Plenum (in place of GG when focusing with 35-40x Loupe)
    ...largeformatphotography.info/forum/showthread.php?p=423824#post423824
    DISCLAIMER: I'm not getting paid by View Camera, Film or Digital Back OEMs to write this stuff nor do I have any financial interest or feel any need to favor one perspective over another.

    DATA POINT ON FILM SCAN MP yield VERSES END PRODUCT yield.

    22-Jan-2009, 21:31
    ...largeformatphotography.info/forum/showthread.php?p=432705#post432705
    Quote Originally Posted by rvhalejr View Post
    ...
    SNR Noise Reference ...imatest.com/docs/noise.html (Standard Deviation)

    The Following Approximates End Product YIELDS for various formats
    (DeFocus <= 0 mm; film flatness <= .001 for LF)

    Let SNR for 4x5 film = 1/3 (200MP film scan yields about 65MP);
    1.75 MP per cm^2 from 3200dpi fluid film scan (10cm x 12.5cm == 125cm^2)
    0.58 MP per cm^2 end product yield
    24-Jan-2009, 18:59
    ...largeformatphotography.info/forum/showthread.php?p=433165#post433165
    Quote Originally Posted by Frank Doering View Post
    Image Annotation 100ASA 4x5 90mm scanned 3200dpi downsampled to 7200x9000
    So both posts seem to be using similar numbers (7200x9000 == 65MP and 4x5x3200x3200 == 200MP) for film scan pixels and end product yield which after all this time should not be that much of a surprise.

    Another WONDERFUL attribute of Frank's example is that it has two of the three principle photographic reference B&W and E6 (similar to the digital look) is shown.

    The third fundamental type is portraiture that originates from one and only one type of film and unique glass that yields images that appear to glow (a property of diffusion). The third type cannot/should not/will not be characterized by any cy/mm in any meaningful way.

    IMO portraiture has been (and will continue to be) Top-end digital's greatest challenge. There may be an analogy here between the overly sharp look of video as opposed to scenes shot with c41 like film.

    I've seen (or heard of) solutions for great resolution and ever improving dynamic range of digital technology. I have yet to see anything approaching what PortraNC can achieve behind the SA 65mm with a Polarizer (or Graduated NDs), UV, Skylight or appropriate mired filter given the color temperature on any given day at any given time of year.

    Anyway, Frank's example of shooting a pool with different cameras is a great idea.

  2. #142
    rvhalejr's Avatar
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    Re: Top-end digital concerns

    Quote Originally Posted by rvhalejr View Post
    The third fundamental type is portraiture that originates from one and only one type of film and unique glass that yields images that appear to glow (a property of diffusion).
    Re: Interesting article on optimum f-stop (See Attachment)
    Ref ...largeformatphotography.info/forum/showthread.php?p=435999
    Ref ...largeformatphotography.info/forum/showthread.php?p=436408

    Diffusion accomplished with Diffraction (with a little fill flash thrown in, of course).

    I love being proved wrong

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