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This phenomenon is properly known as
Small Aperture Diffraction, or circular aperture diffraction, or lens diffraction. This is a problem with digital photography through small apertures (usually noticeable at f/22). It is also a problem with all lasers. Associated terms: Airy's Disc, or Airy Disk, or circle of confusion.
This phenomenon is strictly related to the relative size of an aperture in a lens, having nothing to do with the camera's sensor or film.
The following URLs contain diagrams, charts, and photo examples, which better explain and illustrate phenomenon:
http://www.cambridgeincolour.com/tutorials/diffraction-photography.htmhttp://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/cirapp.htmlhttp://www.bobatkins.com/photography/technical/diffraction.htmlhttp://www.luminous-landscape.com/tutorials/understanding-series/u-diffraction.shtmlhttp://en.wikipedia.org/wiki/Airy_diskBecause of this phenomenon, most serious macro-photographers routinely use apertures of f/11, or f/16, depending upon specific lens.
Note resolution drop-off on this chart of a world-class macro lens.
MTF (Resolution) for Nikkor AF 105mm 2.8 G
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