I tried last night to make good use of above average
seeing and try and build up a 4 to 6 frame mosaic
of the Eta Carina Nebula. Luminosity only.
Once stacked and stitched together it soon became
blindingly obvious that I should have refocused after each
session. I usually do!
I had 3 results to stitch together , side by side and
you can see the deterioration in the second one compared to
the first. No point showing you the 3rd, it's as bad as the 2nd.
I didn't realise this while I was capturing, I should have listened
to John G when he chimed in on the live chat that it looked a little
off! Sorry John.
Here's the stitch...1st result is on the right, 2nd on the left.
Steve