At f/8, every lens produces an identical 10.7-micron diffraction blur on your sensor regardless of focal length or aperture ...
Old-fashioned striped barbershop poles turn in place on a vertical axis, but humans typically perceive the stripes moving ...
Turning a Mathematical Pattern Into an Optical Structure To test that possibility, the researchers created nanoscale versions of the pattern on silicon nitride films using electron beam lithography.
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