Ed Nazarko writes:
> And many lenses, even very good ones, have diffraction fringing at
small
> apertures. ...
Diffraction cannot be avoided, it's the way light behaves when going
through any
system. Every lens, telescope mirror and pinhole has diffraction. The
best optics
are said to be 'diffraction limited' which means that the optics are
about as good
as they can be because the other defects in the system have been reduced
to below
the level of the diffraction.
Received on Wed Dec 11 08:50:08 2002
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