Might be a bit faint for shooting through LP close to a city like Brisbane, but you've done well. I don't trust reported surface brightness much, but DSO Browser puts this at 14 which is getting quite dim, I probably wouldn't have even tried it without dark skies, so I think that just makes your results all the more impressive. The 1100 HD should be large enough though, I doubt you'd be getting much better resolution anywhere in Australia with a bigger scope... I go after smaller things with my measly 840mm refractor :-)
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