Quote:
Originally Posted by Kal
Field Curvature in a refractor is pretty much a function of it's focal length, so both the Sky90 and the Megrez90 would have similar amounts of field curvature, the Sky90 probably a little more since it is a faster scope. The Tak petzvels (FSQ scopes) don't need flatteners.
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The comparison shots I saw at the time I was looking certainly showed the Sky90 without flattener was flat, and the Megrez 90 with flattener which came out to very nearly the same focal length as the Sky90 were flat. But Megrez 90 on it's own was more curved.