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Nature green bokeh sunlight blur leaves background.

In photography, bokeh is the aesthetic quality of the blur produced in the out-of-focus parts of an image produced by a lens.[2][3][4] Bokeh has been defined as `the way the lens renders out-of-focus points of light`.[5] Differences in lens aberrations and aperture shape cause some lens designs to blur the image in a way that is pleasing to the eye, while others produce blurring that is unpleasant or distracting `good` and `bad` bokeh, respectively.[6] Bokeh occurs for parts of the scene that lie outside the depth of field. Photographers sometimes deliberately use a shallow focus technique to create images with prominent out-of-focus regions.