Many thanks to Dean at Starizona for talking me through some repairs to my CPC1100.. I now have a working hyperstar system imaging at F2!!
The Hyperstar is a replacement secondary for a Schmidt Cassegrain which adds some optical components to flatten the field. You attach your camera directly to it at the front of the telescope.
These images were from my second test outing last night. Each consists of 20 sub frames at 10 seconds each (ISO3200). I then took 20 dark frames at the same setting and 5 flat frames. Everything was combined in Deep Sky Stacker and processed in StarTools.