Marc Jacquier wrote:
> 
> I don't know more about blender but usually it is spoken of a 35mm  (36x24mm
> image) film in that discussions.
> so  as angle  means horizontal angle :
> Angle of View = 2 * ArcTan(Size/ (2 * Focal Length * (1 + Magnification)))

That's exactly what the first of the links i posted says too.  But there
is no reason why it has to be a 35mm film the calculations are based on.

Christoph

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