![]() You realize that every one of those points of light, when focused by your lens, is generating its own airy disk on the imaging medium. ![]() ![]() The size of the airy disk, and the proportion of the disk that comprises the outer rings, and the amplitude of each wave in the outer rings, increases as the aperture is stopped down (the physical aperture gets smaller.) When you approach photography in the way Whuber mentioned in his answer: First, diffraction always happens, at every aperture, as light bends around the edges of the diaphragm and creates an " Airy Disk". ![]() There have been some very good answers, however there are a couple details that have not been mentioned.
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