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From what I recall, the GSO Superview is an Erfle design. I have the 30mm and 15mm, but I don't recall using them in my C8 - I've used them pretty much exclusively in fast Newtonians. The 15mm is good and fairs better than the 30. But that's not hard as the Erfle is designed for refractors which have the same focal plane shape as SCT's, and opposite to Newt's. Next time I have my C8 out I'll pull out the Superviews and give them a going over and let you know.
Mental.
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