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Thanks for the feedback JJJ, Troy, Geoff and Marc.
Marc,
I haven't tried a MPCC so can't compare but I am very happy with the Paracorr. Any star elongation in my images is due to some drift caused by differential flexure and despite several attempts and changing out components I've yet to find the cause.
The stars at the edge of the field in my shorter exposures that do not show this drift have very little coma by my reckoning. I don't think I've tried the 400D/newt combination without the paracorr as I originally couldn't achieve focus but have subsequently shortened the OTA so will give it a try some time.
Peter
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