In photography, bokeh is the aesthetic quality of the blur produced in the out-of-focus parts of an image produced by a lens. Bokeh has been defined as "the way the lens renders out-of-focus points of light".
There are four basic techniques to improve your bokeh: adjusting depth-of-field, choosing the proper lens, creating custom bokeh, and using bokeh to relate with the foreground.
TIPS & TRICKS
What is Bokeh and how to create it?
Bokeh
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1. Adjusting Depth-of-Field
Because bokeh is the blurry portion of an image, it is directly related to depth of field, which controls how much of the image is out of focus. A low aperture value produces short depth-of-field, and consequently a larger blurry portion of the image. Also, the shorter the focal length, the greater the depth of field. The last consideration in controlling depth of field is the lens-to-focal point distance. A longer distance between the lens and the focal point creates a greater depth-of-field.
Many beginning photographers always push for the lowest aperture available. This is a mistake. Often, the blurry portion of the photo is more aesthetically pleasing if enough detail is left in the background to make out some shapes or objects. The first rule to better bokeh is to determine proper depth-of-field rather than always choosing the blurriest background available.