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I think Suzy is 100% correct in her advice to use a wider field eyepiece. My brother-in-law has the ubiquitous 8" dob and was viewing omega cent, from my backyard at Bowral last year. Possibly similar conditions to OP's regional city. The difference when changing from a 50 degree 10mm plossl to a 82 degree 9mm nagler was astounding. In the wider filed the whole cluster appeared much more distinct from the background sky, and of course the nagler made the stars towards the edge much clearer. Remember coma will distort the image at the edges so anything you can do to reduce this will improve the view.
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