For a project I have, I have to describe how hyperbolas are used in a camera lens. I think when the "fish eye" lens is used, hyperbolas are used, but I am not sure. I can't find sites that give a fairly simple description so I was hoping someone here could help me.
Thanks.
(ignore my grammatical repetition)
You may need to find a technical tome on lens design, or perhaps search a patent database for "hyperboloid" and "lens". Hyperboloidal *mirrors* are used in astrophotography in the Ritchey-Chrétien telescopes used in professional and high-end amateur observatories, and in a catadioptric design known as a hyperbolic astrograph. Camera manufacturers often claim aspheric lens elements but aren't generally forthcoming as to the shape used; I'd guess most of them are paraboloids to correct spherical aberration.
a hyperbola is a U shape right? cut a clear, flat plastic bottle in half, so you have a U shape and stare through it? what happens? the image gets stretched out into an oval with the clearest part being in the center or at the bottom of the U where the curve is.
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