You may already know that Bokeh is a Japanese word that is used to define the quality of the out of focus area of an image. The fact that Bokeh being quantitative but highly qualitative makes the explanation of the term much harder to understand.

Sometimes it is enough for an average photographer to know this definition, the rest for him is to choose the lens which is supposed to give the images with most appealing bokeh. But for others who are curious about the technical facts that describes this phenomena, I would advise you to read an article on scientifis explanation of Bokeh published on bokehtests.com

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http://bokehtests.com/Site/About_Bokeh.html

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