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Well, Ive actually got this GSO Coma Corrector. I can report it works quite well. Gives sharp stars to the absolute edge of field in my f5 12" dob with a 30mm 82 degree ES eyepiece. Only increase magnification by 10%. Doesn't work at all for Refractors. It looks very similar to my 2 inch ED barlow. It had a 1.25" adapter.
Corrects down to F4. So if your thinking of getting a GSO or skywatcher F4 Newt for whatever reason. Just get one of these too and consider it as part of cost of the scope.
I'll post a picture of it your interested?
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