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Center Bias – Defines a bias shape for the bokeh effects. Positive values make the outer edge of the bokeh effects brighter, whereas negative values make the center of the effect brighter.

Anisotrophy Anisotropy – Allows stretching of the bokeh effect horizontally or vertically to simulate anamorphic lenses. If you want the ratio of height to width of the bokeh to be k:1,  then the value for anisotropy should be sqrt(1/k)-1For example, for anamorphic bokeh, which is 2.39:1, the anisotropy value should be -0.353. 

Optical Vignetting – Controls the strength of the optical vignetting, also known as cat's eye vignetting. This effect is due to the fact that the shape of the bokeh highlights resembles the shape of the aperture. As the distance to the optical axis increases, the bokeh highlights are progressively narrowed and begin to resemble the shape of a cat's eye. The larger the distance from the image center, the narrower the cat's eye becomes. Optical vignetting tends to be stronger in wide angle lenses and large aperture lenses, but the effect can be noticed with most photographic lenses.