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I have a dew strap for my eyepiece in the focuser. But, a hot water bottle wrapped in a towel in your eyepiece case is highly affective. The eyepiece absorb some of the heat and negates dew from forming all night. With a dew strap at providing just a little bit of extra warmth to maintain the heat, I promise you, you would will not have dew problems with eyepieces!
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