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The general consensus in the online astro community is that the Baader Hyperion 68 degree are not well corrected for faster focal ratios <f8 due to significant curvature of field. Having not used one in any telescope I cannot comment from experience but there are enough reviews to tell me they are not Naglers and I would personally not buy one to use with any of my Newtonian reflectors even my 10.1” f6.4.
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