According to Wiki: "In photography, bokeh is the blur,or the aesthetic quality of the blur,in out-of-focus areas of an image. Bokeh has been defined as "the way the lens renders out-of-focus points of light"

Here is one article about Bokeh: http://www.nikonusa.com/en/Learn-And-Explore/Article/h0ndz86v/bokeh-for-beginners.html The principles apply to all brands of camera equipment: not just Nikon.
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