>The "aperture" in PovRay is a square, not a cube.  And the area used by a
>camera lens is a circle, not a sphere.

I know that area used by in camera lens is circle but I dont know that
Pov-Ray uses square. That's why I use circle in my calculations because I
tried to fit area to cube :)

Thanks for correction. Here is new formula:

  aperture = distance_to_focal_point * pi ^ (1/2) / (f * 2)

Matti

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