For monitor viewing 6400 ISO will look great. For quality enlargement, well that is another issue altogether. Star Stacking or Tracking then becomes quite necessary.
Thanks so much, Mark!
I actually think the 6400 ISO will print up large just fine in this case, since it's a composite image of 14 images stitched together. The resolution of the full-size image (the one I added on 9/17/2018 a little ways down on page 1 of the thread) in this case is 15782 x 8181. We'll see though...I'm just deciding what medium to print it on...
