T3D no translations in ortho

[John Toeppen <toeppen@xxxxxxxx>]

Imagine a ten meter focal length lens being used to photograph the moon:
even if you moved the scope over ten meters in translation one's view of
the moon would not change.  Two satellites at the same distance but
convergent at a three degree angle would make a stereo pair.
This example is intended to show how an "orthoscopic view" taken with a
long lens (or afocal system) can be used to make a pair.  The good news
is that keystoning is not a factor needing correction in an ortho pair.
Also, translation of an object some fraction of the field of view of the
system will only work in non-ortho systems.  (George is almost always
right)

John Toeppen


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