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Andrea T. wrote:
> > Ehh, it's conceivable, but it's not at all likely...
>
> I can hardly think of any systematic error that will only affect the
> MTF at one point but not at all others. Maybe, but just maybe, you can
> purposely design a system that does but I can think of none.
Actually, in this instance, we're positing aberrations that affect the
MTF at a whole bunch of points (say, the midrange frequencies) but not
at a small segment right at the very end (near the limiting frequency).
That's somewhat easier to conceive, but as I said, I don't think it's
likely.
--
Brian Tung <brian@xxxxxxx>
The Astronomy Corner at http://astro.isi.edu/
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