Bokeh

Bokeh coined from the Japanese word of boke means “blur” in English. Bokeh is a photographic term used to refer the out-of-focus areas in an image produced by a camera lens while shooting. The aesthetic qualities of the Bokeh can be produced by varied camera lenses.

Bokeh can be more precisely defined as the effect produced by some camera lenses which enhance the overall image quality concentrating more on the subjective and pleasing out-of-focus areas. Nevertheless, such capturing cannot be quantified. Bokeh is especially vital for large-aperture lenses, macro lenses, and long telephoto lenses since these are typically used with a shallow depth of field.

"Portrait lenses" with typically medium telephoto – 85 to 150 mm on 35-mm formatted device, are also in use in Bokeh. The event of Bokeh involves the typical selection of the shallow depth of field (wide aperture) by the photographer to realize an out of focus background and make the subject more prominent.

Bokeh characteristic can be identified the lightly illumed parts surrounding the subject Depending on how the lens is utilized for spherical aberration, the uniform illumination of the disc is realized with the brighter points near the edge or the center. The blur circles which appear to be dimmer near the edges create less-defined shapes blending smoothly with the surrounding images.

Nikon manufactures lenses with a Defocus Control function (Nikkor 105mm f/2 and Nikkor 135mm f/2) that allow the user to increase the amount of uncorrected spherical aberration to alter the depicted out-of-focus areas.