I used to live in Canberra but recently moved 30km east to a small country town - better skies.
Recently I was out in the garden one Friday night and the dew was terrible, the lens on my TOA-130NS was fogged up in an hour or so, which was a shame as the night was very steady. The very next night I had no dew problem at all, despite similar conditions, and was out until around midnight.
I don't think Canberra has a particularly bad dew problem, but it does vary dramatically from one night to the next.
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