Just take a picture in color and you will get radial lines for the stars
with a short focal length refractor. I'm the owner of the 200" refractor
(4.25" diameter single lens refractor) and the color isn't too radical at
that focal length but since the objective is so small, the Airy Disc will be
of a significant size for a digital camera when running at prime focus.

--
Bob May
Losing weight is easy! If you ever want to lose weight, eat and drink less.
Works every time it is tried!