Here is an image of the Homunculus nebula around Eta Carinae.
This was shot with a Canon EOS 550D in video crop mode (640x480@60fps) at ISO6400 1/60th sec exposures through a 12" Sky-Watcher Goto Dobsonian for about 1500 frames stacked in Registax.
There is obviously alot of noise but I was very surprised to find that there is some detail in the nebula comparable to the AAT images I used to see in the '80s:
http://www.aao.gov.au/images/captions/aat045.html
I've attached a jpg of an original single frame and replaced the original image with one less noisy.
Cheers,
Tom