Quote:
Originally Posted by Merlin66
That's why the "old" SCT reducers don't appear to work well on the "new" ACF models; these ACf's have already been corrected for field curvature with the built in corrector... adding an "old" reducer just adds a negative curvature back in.
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The meade ACF's are corrected for coma. They still have field curvature, although less curvature than an SCT. The meade ACF doesn't have a built in corrector either, although the new celestron edgeHD's have a built in corrector.