In photography, diffraction describes the bending of light waves that occurs at small apertures irrespective of camera or lens. The aperture at which diffraction becomes visible (i.e. reduces the sharpness of your photographs) depends on the size of the pixels in your digital camera.

Recommended links: Bob Atkins, Cambridge in ColorCamera-Wiki, FSTOPPERSKen Rockwell, Luminous Landscape, Luminous Landscape 2Wikipedia

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