I came across a folder on my computer hard disk called ‘Pending’. This contained 16 images (each of 5 minutes) I’d acquired in November 2011 of M33 and never got around to processing past the initial stacking. Several attempts at trying out some PixInsight processes later and this is the final result. I’m particularly pleased as the Ha regions (NGC 604 & NGC 595) are well defined even with just the OSC camera frames.
Telescope: WO Zenithstar 70
Camera: QHY9-C
Mount: Astrotrac