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Dew heaters are great! A dew shield will just slow down the inevitable (but their extra advantage is they also block out stray light from the side). Dew heaters just warm things up a tiny bit, just enough to keep the dew off, and they make a world of difference! The heat gets through very easily. I could never see how the heat could get past the plastic/metal cells that hold the optics but it does.
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