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Yep, dew heaters really work!
I now go out in minus degree temps and image all night WITHOUT having to use the hair dryer! My optics stay crystal clear and dry whilst water is running off everything else.
Yes it can happen often. If your optics temp drops below ambient.
Picture a glass of cold drink. Where did all the condensation on the outside of the glass come from? Now imagine your optics being cooler than the surrounding air. Same thing.
Dew heatres don't get hot. They don't even get very warm. They just raise the temp of the optics a few degrees.
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