How do I calculate light meter settings for a camera obscura?
Proper exposure is crucial to pinhole photography. Obviously, the film speed is easy to set (and focal length is easy enough to figure out), but how do you determine the aperture setting?
F-number is the focal length divided by the pinhole diameter. The “focal length” is the distance between the pinhole and the film. You can measure the pinhole diameter with a strong magnifier and a reticle, or check out a clever solution here:
http://ca.geocities.com/penate@rogers.com/diameter.htm
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