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This thread started as a request for input on a choice of two possible refractors (neo achro doublet designs) and simply invited comment on those two, re a purchase decision. I had hoped to limit it so that it did not drift off or get highjacked (as they seem to do) into theory discussions on Achro vs APOs, or the other - and certainly the merits (or not) of reflectors was not a consideration.
Both the scopes were 'fit for my purpose' and I subsequently made a decision to go with iStar (well to buy the iStar objective and build the rest myself).
The rational for a refractor is mine, and no amount of masking a 16" dob is going to make it weigh less than 15kg, regardless of what might be done to make it a better choice. I love my 16" dob but it is big, heavy, and not easy to transport - all advantages that those two refractors offered.
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