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Ha!! Picking my brain will just blunt your fingernails - there's not much there to pick... I'm a total newbie. Got my mount and a secondhand ED80 four months ago, not yet using guiding (which is something I'll have to remedy pretty soon), imaging with DSLRs... I've barely started my journey!
For the record I use Nikons; a D600 and a D3300, teamed with a GSO coma corrector. I don't have any focus problems but it was a major headache getting the camera & CC into the focuser. Required spacers, thread converters and a LOT of filing & sanding. All works well now, or at least I think it does - yet to do anything more than a cursory 20-min test on Trifid (D3300) and Lagoon (D600).
Teaming the 2x with the (very cheap GSO) 5x is probably asking a bit much, yeah... but the tendency is to push it as hard as it can go! I assumed that the CC wouldn't matter in the center but seems to not be the case. With it, everything looks fine. Without it, total shambles. Now that I think about it, that probably means that either the collimation is out or that the silly train of Barlows, collars, spacers and 2"-1.25" adapters etc is so long & so heavy that it's not actually straight. It's a ridiculous looking setup, I can tell you - the DSLR is about 20cm away from the OTA. It's actually surprising it works as well as it does.
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