In a message dated 99-09-27 03:44:10 EDT, you write:
> OK, I get it that stars are a point source; no focal length will render
> them anything other than points. But how dow focal length affect how fast
> the trails form? How is the motion magnified when the point isn't? I've
> been racking my brains over this one to no avail.
Each lens takes in a different angle of view. An apparent small movement on a
wide angle will become an apparently longer movement with a telephoto. Or in
the alternative it, the telephoto, will form a star trail faster. It has
nothing to do with the point source image. Did I understand your question
correctly?
Warren
-point, counterpoint
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