This series of images shows the difference that the seeing, as measured by the FWHM, makes to the resolution in an image. These are single stretched Luminance subs for the Antennae Galaxies across a large range of seeing conditions. My image scale is 0.47 arc secs per pixel. This says to me that my sampling, using a Nyquist multiplier of 3 is good for ~ 1.5 arc secs seeing. The correlation between the seeing and the resolution as we see eyeballing the images is remarkable.
The theory says that, had the seeing been much better than 1.5 arc secs, say 1.0 arc secs, my sampling would limit the potential resolution benefit of the better seeing. Equally, as previously discussed, due to my image scale, I may not even be able to accurately measure such excellent seeing in terms of the FWHM.
https://www.dropbox.com/s/jw6kcgqxqd...ated.jpeg?dl=0