Serene Life

by garik

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Following further research and testing: Here is the result of focus stacking, using Zerene Stacker, 15 images taken with a 60mm macro lens on an APS-C camera at f/16. The subject is a 12"-long .310" diameter rifled barrel.


You can image a red laser across the room shining on your pinhole, and measure the diameter (in pixels) of your first dark ring (if your pinhole is a clean circle). Then knowing pinhole-to-detector distance and the formula for the angular diameter of that first dark ring (about 2.44 * wavelength / pinhole_diameter, in radians) figure out your pinhole ...


The thing that changes with pinhole camera size is the best pinhole diameter to use. The optimal pinhole diameter is such that your pinhole-to-paper distance is the "Fresnel length" (please google for definition) of the pinhole at some representative wavelength of your filter bandpass. If you don't use a filter then you can guesstimate the sensitivity of ...

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