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If the 'scope is a refractor or SCT, I suspect that even if you cover it with a tarpaulin, dew will form on the objective lens or corrector, the finder scope and any eyepieces attached. Not sure about Newts as I've never had one.
I have left mine outside for 3 or 4 hours with Kendrick dew heaters on the objective lens (refractor) and corrector plate (SCT) and they remained dew free. The finder dewed over completely.
I know of one person who has designed a low power heater strip that he wraps around his 'scope before going to bed and in the morning, when he removes the tarpaulin, the ‘scope is dry.
Only on exceptionally dry nights have I enjoyed dew free observing all night long.
Cheers
Dennis
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