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G'Day Bryan,
What sort of scope do you have? I would suggest that if you have a refractor or SCT and you don't want to miss any observing/imaging sessions due to dew, then you'll need both.
The problem with dew is it depends on the relative humidity and the drop in temperature at night. Sydney can get pretty humid at times, so I would expect dew on a reasonable number of clear observing nights.
Al.
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