This was one of the first DSOs I shot, also through a C5: my vintage 1974 black tube C5/750 f/6. So kind of like coming across a version of myself in the past. Like old man Biff in Back to the Future II.
So what would I tell my younger self? You need way more subs, mate. In the future, I have a target integration metric for high quality data at 100-170% sensor scale on galaxies and DSOs: 2-4 hours at f/2.8 with 4.3µm pixels. So for a Nikon D5100 with 4.77µm pixels and an f/10 scope? That's 20-40 hours. With an f/6.3 aperture? That's 8-16 hours.
Here's a crack at processing the data at 100% scale:
(Click for full size.)
With enough integration, all the holes turn into data.
BQ (from the bleeding edge of tomorrow)
Edited by BQ Octantis, 16 May 2021 - 05:15 AM.