Warp wrote:

>   The biggest advantage of using POV-Ray's own focal blur is physical
> correctness.

except for the fact that features in the blur (for example, the
highlights on the most blurred spheres) appear to diffuse into a square
shape due to the way pov distributes the blurring rays. 
What would be ultra nice is if pov could send out rays in a circular
pattern or even hexagonal to mimic more closely the shape of a real
camera's apeture.
The way pov does it now isn't that obviously wrong, but i've had a few
circumstances where the square artifacts have been dissappointing.

see attatched pic for illustration of my point:

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