This is nice little tool.

The only thing that's missing (not from the standpoint of your code, though) is
that POV's blur doesn't *seem* to take into account the 'hyperfocal distance'
of a real lens. I.e., I think that the amount of blur on either side of the
in-focus plane progresses linearly in and out from that point (when it should
do so non-linearly? At least on the +z side of that sharp plane, to 'stretch
out' the amount of blur there--over a longer distance--in order to match the
qualities of a real lens.) I could be wrong about this, but it's been my own
experience, visually.

Ken W.

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