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Most of the development emphasis with the 20" has obviously gone to the optics - which Sky-Watcher generally are doing really well with. Obviously at that price point for a half meter aperture telescope there are going to be shortcomings with the secondary considerations. Sky-Watcher are providing within the access of the dedicated amateurs wallet, an aperture of telescope which has traditionally only been within the professional domain. For 8-10k, to obtain an enormous half-meter aperture, I'd be willing to upgrade a few parts here and there! Other than a self made telescope, the only other mainstream brand that comes to mind which are making this sized telescope for the amateur are Obsession telescopes, but I think from memory they are more expensive.
Good luck with that fantastic aperture telescope and clear skies!
Cheers,
Mark
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