Gentlemen,
 I need to be convinced that the camera projections used in POVRAY  are
meaningful.   A normal distortionless lens gives an image height defined by
the product  focal length  x  the tangent of the field angle.  Very wide
angle lenses must have high distortion to create a finite image height.
Typically a very wide angle lens creates an image height proportional to the
paraxial focal length and the field angle itself.    The 'fish-eye' camera
in  POVRAY seems to be a rectangular image projected onto a sphere  hence
the circular image.  This is not a fish-eye lens.

Comments, please

Don Barron

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