About An Awesome Bokeh !!
All those Fantastic Photos that have Awesome DOF or Bokeh
DOF = Depth of Field
Depth of Field (DOF) is the distance in front of and beyond the subject that appears to be in focus.
Bokeh =
Bokeh (from the Japanese boke ぼけ, "blur"[1]) is a photographic term referring to out-of-focus areas in an image produced by a camera lens. The aesthetic qualities of the bokehs produced by various lenses are open to dispute, but it is generally conceded that an out-of-focus background image can at the very least reduce distractions and emphasize the primary subject.
Bokeh characteristics may be quantified by examining the image's circle of confusion. In out-of-focus areas, each point of light becomes a disc. Depending how a lens is corrected for spherical aberration, the disc may be uniformly illuminated, brighter near the edge, or brighter near the center. Lenses that are poorly corrected for spherical aberration will show one kind of disc for out-of-focus points in front of the plane of focus, and a different kind for points behind. This may actually be desirable, as blur circles that are dimmer near the edges produce less-defined shapes which blend smoothly with the surrounding image. Nikon makes lenses with a Defocus Control function in popular portrait lengths (Nikkor 105mm f/2 and Nikkor 135mm f/2) which allow the user to increase the amount of uncorrected spherical aberration to change the rendering of the out-of-focus areas.
more Info here
en.wikipedia.org/wiki/Bokeh
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