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Bokeh describes the visual quality of the out-of-focus areas of a photograph.

26
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smaller there. Because the lens is fairly highly vignetted, the lens also effectively has a larger f number towards the edges, again reducing the blur. The result is the swirly bokeh you see in this photo. …
answered Jul 4 '15 by Brandon Dube
3
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tangential plane, but not the sagittal plane. This causes the spot and when defocused the bokeh to be larger in the sagittal plane than it is in the tangential plane. This is the same condition that …
answered Jul 6 '15 by Brandon Dube