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  1. #1

    Join Date
    Mar 2006
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    Sharper pinhole image,Part Two

    I finaly did some more "try it and see" tests and found out a couple of things.

    The pinhoe used in conjunction with the camera lens is best.

    The smaller the pinhole the less sharp the image becomes.

    My thaught was that a smaller pinhole gives a sharper image but not so. The camera being used is a 4x5 and the pinhole is .018 or .020 aprox, brass shim stock blackened with a solution stained glass workers use to patina the leadding.

    The film being used is Kodak T max 400, exposures are quite fast, 1/2 -1 sec in sun, 10 sec in shade. when I get someone to post the pictures you can see some examples. (I am computer illitteriate...)

  2. #2
    Dave Wooten's Avatar
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    Nov 2004
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    Kevin, the pin hole size and sharpness is also related to focal length. There are optimal pin sizes for a particular focal length.
    [FONT="Arial Black"][/FONT]

  3. #3
    bobwysiwyg's Avatar
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    I remember someone posting a link to this, so I Googled it again..

    http://www.pinhole.cz/en/pinholedesigner/
    WYSIWYG - At least that's my goal.

    Portfolio-http://apug.org/forums/portfolios.php?u=25518

  4. #4

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    Some Pinhole Design Trade-offs

    Quote Originally Posted by bobwysiwyg View Post
    I remember someone posting a link to this, so I Googled it again..

    http://www.pinhole.cz/en/pinholedesigner/
    And, in general, the smaller the pinhole, the greater the diffraction effect.

    Pinhole design involves several trade-offs. Focal Length; pinhole size; light frequency; diffraction; size of the minimum acceptable size circle of confusion; are the ones I can remember off the top of my head.
    Tom Hoskinson
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    Everything is analog - even digital :D



 

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