Thanks all
Heres a larger version
http://www.iceinspace.com.au/uploads...hcolourbig.jpg
there seems to be a collimation issue top left. The scope has no adjustment for primary mirror collimation, only the secondary. Ive collimated it as best as I can with a single spot laser collimator but that might not be the most accurate way with a schmidt newt.
Mirrors are green plate glass, as is the uncoated corrector plate
Guess if I was keen Id send them to Mark Sutching to be refigured more accurately, then on to Chi Qin to be silver coated, and the corrector plate a/r coated.
The coma present now is less than half of what would be present without the MPCC.
Scott