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But assuming that coma is inherent in a fast mirror and thinking about a much wider field of view in the Ethos...I would imagine that one might "see" more coma and therefore a tool that eliminates (reduces) coma in a fast newtonian scope would seem to me to have merit.
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That's pretty much what the CN discussion was about - the review of the EP in a 20" f/4.5 is about 2/3rds down this page:
http://www.cloudynights.com/ubbthrea...l/fpart/3/vc/1