Contrary to popular belief, depth of field in a photograph does not change abruptly from being pin sharp to soft. Instead, the softness occurs as a gradual transition.
Because of this, a more exact term is used -- "circle of confusion" -- to describe how much a point needs to blurred before it is perceived as being soft and unsharp. Understanding this concept can be key in improving your photography results, especially for advanced photographers.
To learn more about the circle of confusion, just click the link.
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