Here's an image I did which shows part of the supernova remnant in Vela.
The image is a little pushed, a little noisy, but you can certainly see the supernova remnants in reasonably good detail.
I might also do a more suttle/natural appearing version of this image....
96-minute exposure with Houghys cooled Canon 350DSLR on my WO Megrez 110mm refractor.
you can find a better look at the image here
http://www.skylab.com.au/pmsa/VelaSuperNovaRemnant.html
