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Just some extra detail on the manufacture of the optics.
They are a dream as the secondary is spherical instead of hyperbolic and the primary is typically 70% the aspheric correction of a Newt and 60% of an RC so much less work . The corrector lenses are not difficult to make as they are all spherical surfaces. Theoretically at least the surfaces should be smoother than an RC due to less corrective polishing.
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