[geeks] New Horizons

[Sandwich Maker]

" From: Patrick Giagnocavo 717-201-3366 <patrick at zill.net>
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" Later, lenses whose surface is not part of a section of a sphere, known as aspherical lenses, also became possible (the Leica Noctilux f1.2 lens, which was also based on a highly modified Planar design that Leitz has been working with for over 60 years now).  
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" It was certainly known that asph. lenses could correct certain lens defects, but the difficulty was in producing them.

am i right in guessing that the surfaces on real aspheric lenses are
-conic-sections- [in rotation]?  i'm think what parabolic, hyperbolic,
etc mirrors do for telescopes.
________________________________________________________________________
Andrew Hay                                  the genius nature
internet rambler                            is to see what all have seen
adh at an.bradford.ma.us                       and think what none thought