In the focal blur demo file, focalblur.pov, if you set the aperture value to
20, you will notice, if you look at the blurred yellow shape at the top of
the image, that it has hard corners, even though it is blurred. It's as if
two small squares got cut out of the corners. This seems to happen
regardless of how high the blur_samples is set to. I renedered at 800x600 to
see this, it's less obvious at smaller resolutions. Using the default
aperture value of 10, the hard lines along the perimeter of the blur are
still visible, and so are the square cut outs from the corners.

It seems like this is a bug,

Mike

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