Quote:
Originally Posted by rogerg
What I don't like about the Megrez 90 APO .... that I still need a flatenner (Sky90 wouldn't)
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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.