In photography, bokeh (/ˈboʊkə/ BOH-kə or /ˈboʊkeɪ/ BOH-kay; Japanese: [boke]) is the creative aesthetic quality of the blur produced by making use of the DEPTH OF FIELD (
Click for more information) to alter 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 glass 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).
The funny thing is the Japanese term "bokeh" has become almost universally known in the English speaking photography community as a term for “out of focus blur”. But in recent years Japanese photo writers have evidently decided they need a cool new loanword instead of bokeh, so one now often sees the fractured English expression "outo fokasu” a distortion of the English term "out of focus".