> "The center of the zone of sharpness is specified by the focal_point
> vector. Objects close to this point are in focus and those farther from
> that point are more blurred. The default value is focal_point<0,0,0>."
>
> Is this the part that makes you think that the area of focus is
> circular? If so it probably needs to be re-phrased.

I don't think its is circular I think it spherical in shape at least from
the docs
description.  If it is a plane then it should be re-phrased.

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