Hi Doug Mc here . I recently tested an orion 120mm f8.3 acro refractor, only one word , horible. C.a and sphericle aboration were so of puting. My 8 inch dob showed 5 cratorlets in Plato that night, the refractor bearly showed the centre one. I guess it pays to try before you buy. A similar sized reflector would have given much beter views.
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