In photography, bokeh is the aesthetic quality of the blur produced in out-of-focus parts of an image. Bokeh has also been defined as `the way the lens renders out-of-focus points of light`. Differences in lens aberrations and aperture shape cause very different bokeh effects. Some lens designs blur the image in a way that is pleasing to the eye, while others produce distracting or unpleasant blurring `good` and `bad` bokeh, respectively. Photographers may deliberately use a shallow focus technique to create images with prominent out-of-focus regions, accentuating their lens`s bokeh.

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