"scott" <sco### [at] spamcom> wrote:

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> > jiangzhijun wrote:
> >>  well,I'd like to put forward a question,"How to Calculate or know
> >> the Focal Length of the perspective type Camera in POV-RAY3.6",can
> >> anybody be so kind to help me? I am a new user to the POV,Thanks!
> >>
> > To make a povray camera that produces the same effect as a given
> > focal length on a 24x36 real life camera, you need to add the
> > following to the camera definition:
> >
> > angle 2*atan2 (36, 2*f)*180/pi
> >
> > For a 50mm camera lens, this gives an angle of about 40.
>
> Do you have a formula to set the aperture as well for focal blur? :-)  That
> would be useful.

  Thanks for the above all, :)
  I am on my way to generate such a video sequence:A focus-length-fixed
perspective camera,moving along certain axis or direction,before some
object in the scene.
  I have done some expriments to recovery the focus-length of the above
camera,but was exhausted to find that the focus-length seems floating,Is
that real in POV? and how to fix the camera focus-length even when it moves
along?

       angle 2*atan2 (36, 2*f)*180/pi
  if this 'angle'  is fixed,does it mean that the focus length is fixed?

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