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Nightshift, I appreciate everything you are saying, as these GS (and I'm sure Synta too) Dobs are a cost/quality compromise. Also, it sounds like you got especially unlucky with the OTA (probably had a bit of surface rust before it was painted). But the optics is very capable and the scopes are usable out of the box, and can be made even better with a few tweaks. As far as I know there is nothing better available until you start looking at the Obsession style Dobs which cost around $5000+ for a 12.5".
The smartest thing Anthony at Bintel Melbourne said to me was that if you want a no compromise Dob, you build it yourself, because every off-the-shelf big scope is going to have its problems that will need user-tweaking. Failing that, get someone else (like that truss scope guy in North Vic, I forget his name) to custom build one for $$$.
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