> You are using very small values. When I multiply all your values by 100, I get a
> bright and sharp bright spot without any ring. This point to precision related
> errors from the floating point processor.
> Changing your base unit from meter to centimeter or milimeter could realy help.
>

Alain seems to have hit the nail on the head. It was indeed a precision
issue. Using a millimeter base now with no problems.

Thank you all for your effort.

Regards,

Johann

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