POV-Ray: Newsgroups: povray.general: How to calculate the focal length?: Re: How to calculate the focal length?

POV-Ray : Newsgroups : povray.general : How to calculate the focal length? : Re: How to calculate the focal length?		Server Time 4 Aug 2024 16:10:11 EDT (-0400)

From: Christoph Hormann
Date: 29 Mar 2003 09:05:19
Message: <3E85A858.67B58C91@gmx.de>

Andreas Kreisig wrote:
> 
> Hi!
> 
> POV-Ray uses the horizontal angle to determine the clipping. Does somebody
> know how to calculate the focal length when only the horizontal angle is
> given?
> 

The relation between camera angle and focal length obviously depends on
the film/sensor size of the camera.  

See for example:

http://www.colloquial.com/photo/formats.html
http://www.mat.uc.pt/~rps/photos/angles.html

Christoph

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