Thanks Nick and Alex,
Thanks for the info. There's a lot here to get my head around and I'm sure I'll have more questions, so rather than clutter this great article of Alex's I think I'll start a separate thread for learning about star testing and collimating my scope.
http://www.iceinspace.com.au/forum/s...40#post1399240
Looking forward to getting into the observation challenges put out in this thread...