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I had Kendrick dew heaters for years ( still do ) on my visual and imaging Newts and after a year or two struggling with dew even using my dew control , I don’t even bother anymore as dewy air still affects your visual observing and also to a greater extent results in poor quality images.
If the humidity is up around 85% or higher and the wind is less than 10km/hr for most of the night, I know it’s going to be a waist of time, a quick check at 7pm outside and I know that dew has already started to form and is going to get worse. This is the case at both my sites 250km apart.
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