Graeme have a look here....
http://www.iceinspace.com.au/index.p...3985dbf886e409 though it is doing to be a challenge without tracking. Your exposure times with no trailing for non tracking mounts is determined by the FL of your lense/telescope. At 0deg dec Time = 700/FL, near the pole T=1000/FL. So the longer your FL the less time you have for trailing. Maybe try to make a Barn Door Tracker for some widefield imaging. See jjjnetties thread here for info
http://www.iceinspace.com.au/forum/s...ead.php?t=6307