On the following scene we lit our model using a few spherical lights. The default 1.0 value produces a perfectly circular disc while values less than 1.0 or greater than 1.0 will respectively squash the shape vertically and horizontally. The Aspect parameter can squash the depth-of-field effect and simulate the effect observed on anamorphic lenses.
This is better explained with the images below: Values greater than 1.0 have the opposite effect: they make the outer parts of the disk more important. Values lower than 1.0 make the center of the disks more important than the outer parts. The default 1.0 value makes the disk intensity even. The "Power" parameter controls how these disks appear. The blurrier a pixel is, the larger the disk. You can think of out-of-focus pixels as blurry disks. If you're using a bokeh image, you can simulate this effect by multiplying your image by a radial gradient which is dark in the middle and bright on the edges. This parameter has no effect when you use a bokeh image.
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