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"Would you even need the MPCC after doubling your focal ratio?"
Doubling doesn't quite get rid of the coma. It's close but no cigar. If I use the Televue "big barlow" which I've also got and ditch the Baader corrector I'll have an extra distance of about 86mm to the ccd which according to the Televue graphs will give me a focal ratio of about F15. That will probably do for some DSOs like M104 etc. It still won't get me F10 but I may have to live with that.
Cheers
Stephen
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