Technical PDF on optimum pinhole sizing
Posted 28 March, 2006 in Pinhole + Extra Geeky
Excerpt from by "The Pinhole Camera Revisited or The Revenge of the Simple-Minded Engineer", by Kjell Carlsson:
"The image of a point object, the Point Spread Function (PSF),
should be as small as possible to produce a sharp image.
"Geometrical optics approximation: Hole should be as small as possible.
"Fraunhofer diffraction approximation: Hole should be as large as possible.
"No optimum size is found!
"Conclusion: The optimum size is found in a region where neither geometrical optics nor Fraunhofer diffraction is valid!"
For the more mathematically inclined, this paper discusses the preceeding conundrum and has simulated sample images for various pinhole sizes. I can’t follow the math, but I found it an interesting read nonetheless.
Via f295 DIY Photography Forum
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