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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.

		Jerome
- --
******************************
*      Jerome M. Berger      *
*  mailto:jeb### [at] freefr   *
*  http://jeberger.free.fr/  *
******************************
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