Well, I tried the barlow again between two showers (I can't believe it's raining in Adelaide in February...). I collimated the scope as per Chris's instructions, then I inserted the 2" adaptor, the barlow, the 1.5" adaptor, the EP and ... voila! I could focus on a distant tree without any problem. This said, having to put a 2" adaptor on a 2" focusser isn't Sky Watcher's greatest design idea.
Cheers,
Eric
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