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  1. #11

    Join Date
    Feb 2004
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    san jose, ca
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    Hi,

    Been thinking about this a fair amount lately. There is an optimum pinhole size per focal length (film to pinole distance). That said, any size pinhole will give you an image given enough exposure time. But... and this is a consideration with multiple pinhole systems, the length from pinhole to film is greater as you get away from the perpendicular of the pinhole to the film plane. If you look at good pinhole calculators, they will give coverage information. Now coverage info is just the size of image circle that you can expect a reasonably well exposed image at the edge of the circle without overexposing the center.

    So what does that mean? If you know the image circle for a particular aperture pinhole and space several pinholes that far apart on the lens (?) board of your pinhole camera, you should have one image run into the other, with no sections of over (or under) exposed image between them. A photomontage blend. Calculate your exposures as if you had just one pinhole and expose either simultaneous or serially.

    tim in san jose
    Where ever you are, there you be.

  2. #12
    Surly's Avatar
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    May 2005
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    Yep, I think you nailed it there. Seems to me that using sheet film would afford the best use of space for multiple "lenses".
    One other thing - for me understainding the film to aperture ratio made immensley more sense when I found out the f in f stop stood for factor.
    I think I need to start building one of those.....
    To believe your own thought, to believe that what is true for you in your private heart is true for all men, — that is genius.
    Ralph Waldo Emerson

  3. #13
    B-3
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    Apr 2005
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    Paradise
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    Coverage - that's the ticket. Thanks Tim, good insight.

    Surly - I'm thinking the same thing, but since I haven't even tried a single pinhole yet, it may take me a while to get there. Happy Trails!

  4. #14

    Join Date
    Dec 2005
    Shooter
    Pinhole
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    I made one that has three close together in a row. You just make a single exposure at the standard time and the results are very abstract; doubling like something an insect might see. Color film looks cool.

  5. #15

    Join Date
    Dec 2005
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    I've almost completed a three-pinhole-array panoramic camera. I'll post a sample when I have one.

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