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Astigmatism
I have two F5 dobs, a 12.5" and a 10". Coma (not astigmatism) is barely evident in my scopes, but I am running purely Televue Nagler and Panoptic eyepieces. If I get ultra-fussy ie no alcohol to blunten my eyesight, I can detect a small amount of coma that is corrected with the inclusion of a paracorr. In all honesty though, the original coma is not really a problem.
I suggest you see if you can borrow a better class of eyepiece to try out first. If it improves the issue, you money may be more effectively spent on a good eyepiece rather than a paracorr.
Cheers
Brian Clements
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