Re: diffraction, macro, apodization

[P3D Josh Rubin <jnr@xxxxxxxxx>]

Thanks Richard, Dave and Peter, for your thoughts.

Apodization sounds interesting, although it sounds
like it is intended to create multiple hard-edged apertures
and so somehow make the diffraction cancel out.
Also, since it's about astronomy, any effect may
depend on parallel beams. Using a window screen
wouldn't seem to eliminate the hard edges, only
multiply them.

Dave's thought that a single fuzzy gradient
would cause a larger circle of confusion appears
to assume that the outer edge of the gradient is
at least as large as the hard-edged aperture that
it's being compared to.  But what if it's smaller?

I mean, I don't know the math or optics much, and
a circle of confusion is just how I muddle on
through . . .

Josh

Joshua Rubin
(h) jnr@xxxxxxxxx
(w) jrubin@xxxxxxxxx


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