I am going to study this further this weekend along with the inc file that I
was refered to in this thread.
Maybe I can come up with a correlation between f-stops and Aperture.  The
f-stops are related mainly to control of depth of field.  Where one area is
in focus with the background and foreground thrown out of focus.  Mainly if
you focus on a point, one third of the line in front of the point and two
thirds of it behind the point will be in focus (the line being the total
line in focus or the depth of field).  One other variable is the Hyper Focal
setting where ALL is in focus to infinity.
so it will be some interesting work.
Maan

"Bob H."
<per### [at] aolcom?subject=PoV-News:%20&body=Relating%20to%20POV-Ray:>
wrote in message news:3a755a2e@news.povray.org...
> > On Sun, 28 Jan 2001 17:39:49 -0600 Maan M. Hamze wrote in p.programming:
> >
> > >Although the value of keyword Aperture in povray is random and is not
> > >related to
> > >f-stops (I wish it was), is there any rough correlation that one can
draw
> > >between povray keyword Aperture on one hand, and a camera actual focal
> > >length and f-stops on the other hand?
>
> There must be, if only a "rough" estimation anyway.  Just a guess, but I
think
> the focal blur in POV-Ray is only linear.  I don't know.
> Render a simply test scene based on a real life photo and I think you'd
get a
> correlation with some math involved.  Think the main difference is that
f-stops
> aren't linear to the focus.
>
> Bob H.
>
>
>

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