Thanks all - observing was pretty rushed, but unfortunately that's my life just at the minute!
Les, thanks so much for the additional information, and the clarification with M Centauri. I can understand how the star might interfere with viewing this globular, but at the low powers I use I find it a strikingly beautiful 'conjunction'. No doubt if you were trying to resolve the cluster the story would be different! As far as tiny PNs go, I generally acknowledge that most are out of my reach, because even when they're 'bright' enough at low powers I can't push the magnification up to get any sense of their structure.
SAB, there are a few dim galaxies around NGC4945, including 4945A at a bit fainter than mag 13, and 4976 at about 11. I was aware of them from a photo I'd seen in the Hawaiian Astr Soc on-line deep sky atlas (a great source for visual observing, with photos, maps & descriptions on a constellation-by-constellation basis), but didn't see them last night - will have another look at this area on a better night.
http://www.hawastsoc.org/deepsky/ima...n/ngc4945s.jpg
The 3 brighter galaxies will fit easily in my FOV (the fourth shown is WAY out of my league, LOL!).
Here's a link to the constellations listings of the HAS:
http://www.hawastsoc.org/deepsky/constellations.html
Cheers -