I think you need to look at it from the perspective of points, or vectors and
how they behave when scaled.

You have your camera position at a non-origin position, and then you scale it.
So it MOVES.
I'd say the same goes with the look_at point.

Try using a vector transform on a "point" and see if the scaling transform on
two vectors defined to be your camera position and look_at points give you
results that make sense.

#declare MyTransform = transform { scale { ... } }
#declare Foo2 = vtransform(Foo1,MyTransform);

from:
http://news.povray.org/povray.newusers/thread/%3Cweb.56d370be14d864ee5e7df57c0%40news.povray.org%3E/?ttop=418731&toff=5
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