Quote:
Originally Posted by tileys
...something I've found is that I need a bit of extension to get a decent focal range - i.e. don't seat the eyepieces all the way into the focusser before you tighten down.
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... you mean your EPs don't quite reach focus and need to come out a little more than the focuser allows. That's more so with the 8" GSO Dobs - unlikely to be an issue with the 12".
You can try raise the mirror by undoing the collimation screws some of the way (and then recollimating of course) and that should get you to focus without having to pull EPs out of the barrel.