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I almost did buy the Vixen NA 140SS but decided to go with a DIY build using the iStar 127mm f12 R30 objective.
I was not rubbishing refractors, rather praising good dobs. 'I come not to bury Ceasar but to praise him'.
Refractors continue to be the most expensive scope per inch of aperture, and exotic glass formulations designed to improve performance do not help change that equation.
I grant you that if I was comparing a 102mm refractor and a 102mm dob the refractor would win hands down but if you compare equivalent visual value propositions the dob will always win. A 16" dob cost less than a good 4" APO refractor, and the dob comes with a usable mount.
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