Hi David,
not bad for a first attempt.
What was the seeing like?
Did you measure the subframes as you were going
with Maxim DL to see the FWHMs?
It seems like the stars are a bit bloated for some reason?
You might not have the coma corrector spacing exact & the collimation could be a little out
combined with not having an exact focus.
What did the guide graph look like?
Are you sure the blacks are not clipped?
I would have tried some selective contrast adjustment on the brightest
part of the nebula to make the image pop.
cheers
Allan
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