I took my guiding camera (DSI PRO II ) and took 90 x 42 sec subs of M51 then combined the luminance with my Dslr RGB image looks like a winner might have to play around with this a little more
Thanks Guys I was surprised how well it came out to answer a few questions combiing is so easy with REGISTAR I can take images from my C11 and combine them with my SV 102 with no problems it well worth checking out.
Funny you should mention the Jellyfish I shot that at the beginning of the year and just recieved picture of the week from stellarvue here is a link http://www.stellarvue.com/astrophotography.html