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  1. #1

    Join Date
    Jan 2005
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    20x24 Pinhole Camera hole size

    Hey Folks!

    I wanted to know if anyone has any experience working with a 20x24 pinhole camera.

    Basically need to know a good starting point for pinhole size that would cover a sheet of 20x24 that is not curved , and I prefer a look that simulates an image one would expect from a 30 in. lens on that format...so slightly longer than normal.

    Thanks in advance !

    Michael

  2. #2

    Join Date
    Oct 2005
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    Westminster, Maryland, USA
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    http://www.pinholeresource.com/

    These guys are a good source for info.

  3. #3

    Join Date
    Aug 2004
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    Pittsburgh, PA
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    Michael-
    you can check out mrpinhole.com for a fairly nice online pinhole calculator from which you can determine angle of view, pinhole size, focal length, etc. and, there's always the f295 forum (all lensless imaging welcome)

    http://www.f295.org/Pinholeforum/forum/Blah.pl/Blah.pl?

  4. #4

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    Jan 2005
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    Excellent ! Thanks very much.

  5. #5
    Jim Jones's Avatar
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    Jan 2006
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    Rural NW Missouri
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    My favorite downloadable pinhole calculator is free at PinholeDesigner. For optimum sharpness in the center of the field I suggest a user constant of 1.5 with this program. Pinhole photography generally favors wide angle pinholes over the longer ones due to the laws of optics. For example, a 15" focal length pinhole can resolve 1.4 X finer detail on the negative than the 30" one. However, it will have more falloff in both sharpness and illumination towards the corners of the image.



 

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