This is an old image of the 30 arcsecond diameter planetary NGC 3195.
It was taken with a "modest" C11 at f/10. It is one of my favourite images despite the fact I still had not mastered star colours at this stage.
Details are 20m L=UV filter, 5m R, 5m G, 7.5 m B ST-8E & AO-7.
RGB binned 2 X 2. C11 scope at f/10.
http://users.westconnect.com.au/~sjastro/ngc3195c.html
Comments and criticisms welcome.
Steven
http://users.westconnect.com.au/~sjastro/small