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Thread: Pinhole camera help needed

  1. #1

    Pinhole camera help needed

    I have made a few pinhole cameras over the years, mostly from modifying old roll film cameras. I have recently acquired a large film holder (8.5x15") and I want to build a wide angle box pinhole camera for it. My intention is to shoot x-ray film then make cyanotype prints.
    So, I am having trouble calculating the focal length - I want it to be wide angle - about equivalent to a 24mm lens on 35mm film, and then the optimal pinhole diameter for that f/l, for the sharpest possible pinhole negatives. I will be making the pinhole out of very thin brass shim material.
    I have tried a couple online pinhole calculators but am confused with the results.

  2. #2
    500+ Posts jon.oman's Avatar
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    Quote Originally Posted by Randy View Post
    I have made a few pinhole cameras over the years, mostly from modifying old roll film cameras. I have recently acquired a large film holder (8.5x15") and I want to build a wide angle box pinhole camera for it. My intention is to shoot x-ray film then make cyanotype prints.
    So, I am having trouble calculating the focal length - I want it to be wide angle - about equivalent to a 24mm lens on 35mm film, and then the optimal pinhole diameter for that f/l, for the sharpest possible pinhole negatives. I will be making the pinhole out of very thin brass shim material.
    I have tried a couple online pinhole calculators but am confused with the results.
    I think you need to look at the angle of view of each format:

    35mm



    Your Custom Format



    Then take the custom focal length you determined to plug into the pinhole calculator for the optimal pinhole diameter. I would compare the diagonal angle of view since the formats are different.

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