On 20/10/06, Pål Jensen <[EMAIL PROTECTED]> wrote:

> I believe "ring bokeh" happens due to the laws of optics (physics) when a
> certain degree of  defocusing occurs. Due to the way lenses are commonly
> used it occurs most often in lenses around the middle focal lenght.

That's not what I understand, check the Harold M. Merklinger paper.

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Rob Studdert
HURSTVILLE AUSTRALIA
Tel +61-2-9554-4110
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[EMAIL PROTECTED]
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Pentax user since 1986, PDMLer since 1998

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