This little scope has very good optics in the range between 1/6 and 1/7 wavefront p.t.v. and over 96.5 strehl ratio. The Ronchigratings are nearly perfect straight and by the human eyes it is extremely difficult to see any bends .This telescope is from the middle range, not the best and not the worst, just very good. Markus Ludes (APM-Telescopes)
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