Quote:
Originally Posted by Merlin66
I'm sorry.... I seem to be losing the plot here...
The resolution obtained in long exposure images is limited by the seeing conditions, not the theoretical optical resolution of the optical system.
Over sampling I think is generally better than undersampling..
|
It’s not that simple.
Seeing affects smaller apertures differently to larger ones.
While the larger aperture typically presents an image that fuzzes in and out, it remains positionally stable on the sensor.
The smaller aperture images presents less perturbed airy disk, but it is positionally unstable.
Seeing clearly varies from night to night....but to assume 2 arc sec is as good as it gets is nonsense. Some nights fleetingly present sub arc second seeing.
Having the aperture to gather signal quickly in those conditions is simply another reason as to why aperture rules
