During the night, if temperatures drop enough, water vapor in the air will condensate on cold surfaces. Well our equipment cools off. Getting some water on the outside of our telescopes does not really matter much. Having water condensate into water droplets onto mirrors or lenses is devastating though. It distorts images dramatically to the point taken pictures are useless.

So how to deal with dew? It is actually quite easy: Or you capture the dew before it gets to our optics, or you heat up our optics so water condensates elsewhere.

Dew Shields

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Dew Heaters

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