Just for a bit of fun I reprocessed some old data on Abell 31 (aka SH2-290, PK219+31.1), a faint planetary nebula in Cancer, for a much better result. Although the nebula is large (around 18' diameter), it is very faint.
The link is here
https://www.astrobin.com/33680/B/
Date: February 2013
Telescope: 110mm William Optics refractor
Camera: QSI 540wsg
Mount: AP900
Processing: PixInsight.
FOV: about 60' x 60'