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Thread: 5x7 design question

  1. #1
    500+ Posts Isis's Avatar
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    5x7 design question

    I have order some Direct positive paper to use in both lens and to be built pinhole camera.
    While I have no problem building the camera I wondering on people opinion on the nicest "focal length' for a 5x7.
    Regards Shane
    - Suggestions on how to improve image always welcome
    http://www.ipernity.com/home/isisford/
    http://www.flickr.com/photos/isisford/

  2. #2
    I often use a 5x8 inch paper negative, and find that with a pinhole diameter of roughly .3 mm a distance to the neg. of about 10 cm works well. This gives a focal length of approximately f/300. I don't measure either of the values precisely, but this ball park approximation works well for me.

  3. #3
    500+ Posts dvoracek's Avatar
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    Although I'm pretty much if a fuddy duddy working almost exclusively at 24mm on a 24x36mm frame (BTW that works out to about 125mm on a 5 x 8 sheet of paper), I don't think there is a nicest "focal length." The camera doesn't take the picture, the photographer does.
    http://idea.uwosh.edu/nick/pinholephoto.htm

  4. #4
    so far i'm liking 60mm quite nicely.

  5. #5
    500+ Posts Isis's Avatar
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    Yes I just saw that, nice piece of woodworking. I would of thought the 60mm had a bit more distortion at the edges, inc light fall off. Ill keep my eye on your images.
    Regards Shane
    - Suggestions on how to improve image always welcome
    http://www.ipernity.com/home/isisford/
    http://www.flickr.com/photos/isisford/

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