Recently I ran into this web page:
http://www.bobatkins.com/photography/technical/field_of_view.html
It describes the formulas used for both rectangular and 4 types of
fisheye lenses: equisolid, equidistant, stereographic and orthogonal.
It also contains a graph plotting the associated functions ("frame
size" can be replaced with "distance from frame center"). Just be
looking at this graph it seems like it should be possible to unite
them into one model somehow. Could come in handy now :)
--
Bart
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