Unfortunately mother nature has given Sydney very few clear nights of late, so it is a case of grab what you can...
This is more a proof of concept image that I used to test my system at around 3700 mm focal length.
Why? As Fred says "narrow field rules!"
Despite the eggy edge stars (need to use a different barlow) and slightly soft image (a steady atmosphere at these FL's is very critical) I don't think the result was too tragic.
http://www.atscope.com.au/BRO/gallery37.html