Try here for focal_point:
http://www.povray.org/documentation/view/3.6.1/248/

"sitha" <nsi### [at] excitecom> wrote:
> Hi Everybody,
> I am willing to do image analsis using pov-ray. Here I have a small problem
> aboyt focal length of camera used in pov-ray. when we set the camera we
> have,
> 1.location
> 2.direction
> 3.angle
>
> above three parametrs but dont have focal length. Is there anyway to define
> focal length? Pls help me as soon as possible. If we dont have focal length
> in POV-ray camera, I should go for other options.........
>
> Thanks lot in advance.
>
> Regards,
> Sitha.

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