ingo <ing### [at] tagpovrayorg> wrote:
> in news:web.4243177b95205ba1a0c272b50@news.povray.org gonzo wrote:
>
> >> With the camera, we can change the distance of focale? Is this the
> >> angle into the focale and the objet?
> >
> > Povray doesn't have focal length as such, but you can move the camera
> > further from, or nearer to the object and then play with the angle to
> > achieve the same field of view.
> >
>
> Have to correct you here a bit Gonzo, changing the camera angle is the
> equivalent to changing the "focal length" in real photography. Even
> this is not completely true, POV-Ray's perspective camera is a pin-hole
> camera, so changing the angle in POV is like changing the distance
> between the film plane and the pinhole.
>
> Changing the camera angle has the same effects on the image as changing
> the focal length with a camera, except for the depth of field, which is
> infinite just as in a pinhole camera. One uses the angle to determine
> the field of view and the distance to the object for the perspective
> (further away, 'flatter' perspective, less 'distortion' near the
> corners).
>
> The focal blur POV-Ray is set through a few parameters and does not
> depend on focal length or aperture.
>
>
> Ingo

Ok. Thanks for all

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