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This article is from the Photographic Lenses FAQ, by David Jacobson with numerous contributions by others.

37. What is the optimum aperture for a pinhole camera?

d = .036 sqrt(Si), where d is the diameter of the pinhole in millimeters and Si is the distance from the pinhole to the film in millimeters. See the technical notes.

 

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photography, lenses, focal length, bellows, focus, pivot