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Takahashi TSA-120 vs. TOA-130
The TOA-130NS has but 10mm more aperture than the TSA-120; Yet there is about $1.5k difference in price between them.
I notice the OTAs are substantially different in weight - much more so than would be expected for the extra aperture alone: 6.7kg vs. 10.5kg.
So can someone please explain to me why that extra 10mm aperture is worth paying $1.5k for? Is it worth it for what a purely visual observer (i.e.: me) would see through the eyepiece?
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