Since we were on the subject of ISO and noise...
Only thing done to the image was a crop, but other than that, it's straight from the camera.
ISO 1250, f18, 160s, 680mm (1020mm effective w/partial frame sensor)
Same image, but after a little post processing.
I bumped this shot from f/16 to f/18, to see if the lens was any sharper. I think it is negligible.