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Maybe the corrector is much less critical at F6 Bojan ? I've got an 8" F5 and coma is terrible without the corrector.
Sorry Martin but I can only comment on the Baader. That fixed coma enough to my satisfaction (but I have a low threshold to acceptance).
My main issue was tilt and I think this would be a problem with any corrector. It took me ages to realise it was tilt, not having had a newt before. When I figured it out, it didn't take too long to adjust the focuser . It's pretty good now (subject to my low standards).
Edit: just looked at Andy's pic. That's pretty amazing - parracor looks like it does more than a job.
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