Last Updated：2022/12/24
For telescopes with circular apertures, the size of the smallest feature in an image that is diffraction limited is the size of the Airy disk. As one decreases the size of the aperture in a lens, diffraction increases. At small apertures, such as f/22, most modern lenses are limited only by diffraction.
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For
telescopes
with
circular
apertures,
the
size
of
the
smallest
feature
in
an
image
that
is
diffraction
limited
is
the
size
of
the
Airy
disk.
As
one
decreases
the
size
of
the
aperture
in
a
lens,
diffraction
increases.
At
small
apertures,
such
as
f/22,
most
modern
lenses
are
limited
only
by
diffraction.
