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As Gary points out, altitude (IMO) is of more value with respect to limiting magnitude than resolution due to seeing (and occasionally it'll get you above low level cloud or fog).
In my experience, the average seeing in Oberon is probably a bit worse than Sydney due to the higher average wind speed over the great dividing range. The GDR acts like the top surface of an aeroplane wing or the bottom surface of a venturi - in general the wind speed over the mountains is higher than either side of it. But when there's no wind... seeing can be excellent, provided the jet stream also plays well.
Al.
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