Both images taken with Starfire 152 EDF at F7.5 using Starlightxpress SXVH9 CCD, same site
(Canberra ACT @ 780m ASL), same photographer, same mount, with only basic processing and exposure
times were similar too, plus careful attention to focus was used (the imager is anal about this)
in both cases.

Image on the Left was taken in very poor seeing

Image on the right was taken in quite good seeing

Even at the relatively modest focal length of 1140mm - the difference is remarkable!