bokeh

Definition: Subjective quality of the out-of-focus image projected by an optical system, usually a photographic lens. * The unsharp part of an image often makes the major part of a photograph: visually we prefer smooth gradations and spherical out-of-focus highlights: this is good quality bokeh. * Poor bokeh is caused by poor control of residual lens defects as well as the design of the diaphragm aperture blades or in-lens shutters. Lenses with circular apertures are more likely to produce smooth bokeh. * Transliteration of Japanese word.

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