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Have been away- only just saw this post. I'm in Canberra and have both a dob and sct. Usually only observe for a couple of hours and finished by 11 or 12. Don't need dew protection with the dob. Can usually judge when dew shield is needed for sct. I might start without it but more often than not eventually put it on unless night is warm and/ or there is a breeze. The dew shield is unheated. I do own a dew heater strip as well but never use it - but as I said I don't stay out really late when it can get really cold.
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