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An important aspect of the photographic vocabulary, produced by focus selection, limitations of depth of field, optical qualities, subject motion, camera motion, or other technical problems.

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Is there an “optimal” background distance when striving for a minimally distracting background?

Let's assume a thin lens and an object O in focus at a distance of dO from the lens. Further, let's assume there's a large out-of-focus background object B at a distance of dB. Now, we know ...