Wasn't it Bill Brehm who wrote:

>Is there any way to simulate lens distortions such as barrel distortion and
>pincushioning? I want to generate some purposely distorted images to verify
>some equipment that is supposed to measure and correct for such distortions.

If you happen to know the mathematics of the shape of a lens that
produces a particular type of distortion, then it should be possible to
construct such a lens and point the camera through it.

-- 
Mike Williams
Gentleman of Leisure

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