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Actually, foreground and background blur is aka depth-of-field. The word bokeh was derived from a Japanese word 'boke' by Photo Techniques magazine editor Mike Johnston in 1997. Japanese use of the word 'boke' is in the sense of a mental haze or senility, or just as a haze, or blur.
Bokeh is not adjustable. The only way to get better, or worse, bokeh is to use a different make/model lens. Lens design and construction determine the 'quality' of the bokeh any lens can produce. More specifically, the aesthetic quality of blurred image elements is a function of the Circle of Confusion a lens produces.
Consumer grade lenses generally produce less pleasing bokeh than do professional grade lenses. Pro grade lenses usually have superior optics that have minimal optical aberrations, more aperture blades, and the aperture blades have rounded profiles and rounded edges, when compared to consumer grade lenses.
Bokeh is not adjustable. The only way to get better, or worse, bokeh is to use a different make/model lens. Lens design and construction determine the 'quality' of the bokeh any lens can produce. More specifically, the aesthetic quality of blurred image elements is a function of the Circle of Confusion a lens produces.
Consumer grade lenses generally produce less pleasing bokeh than do professional grade lenses. Pro grade lenses usually have superior optics that have minimal optical aberrations, more aperture blades, and the aperture blades have rounded profiles and rounded edges, when compared to consumer grade lenses.