A Bokeh can be good as well as bad caused by chromatic aberrations or the Len’s Aperture shapes.
The Number of Aperture or Shape of the blades defines the Nature of
bokeh. For Example: an 8 Blade diaphragm will produce a Polygonal bokeh.
Every lens can’t be perfect all the way, but there is a spot at
which the lens can attain its best focus called as Circle of Confusion
(COC).
Using this COC the depth of field for an image can easily measured.
Back-lit Background works great in producing pleasing Bokeh’s.
Looks for Highlights in the scene, basically Highlights with
interluding shadows are the ones which get transformed into Pleasing
Bokeh’s.
Trying to maintain a equidistant between the camera and the subject
comparing to the subject and the Background, will logically produce
great results.
Bokeh need not be round or spherical in shape, any blurred out background is also termed as Bokeh.
The Larger the aperture better the Bokeh.
In Minolta and Sony they manufacture a special lens with smooth
trans focus + an apodization filter to create a Pleasing bokeh, making
them one of its kind in the Market.
By Placing a simple shape cut out from a card in front of the lenses creates your own shape of Bokeh.
The Spherical aberration + Chromatic aberration at times can cause very displeasing bokeh shapes and color.
Using extension tubes in macro photography can give great results of Bokeh.
When not sure about the bokeh you will achieve, try viewing the scene with eyes crossed, you will love what you see.
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