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Hemi,
I presume you store your scope somewhere outside or your storage location is not air conditioned. If the scope were cool from being in AC and you took it outside to a high humidity area the glass would fog up.
If you are outside and the temp drops below the dew point, the glass would fog up.
I don't have a lot of problems with dew but I do have problems with streetlights. I use the dew shield to help shade the lens of my refractor, or the secondary mirror of my reflector so that I don't get dew or frost when the temp drops below freezing.
BTW, I also have a small, cheap, 12V hair dryer that can defog the eyepiece if it fogs up. Could use that on any glass. Doesn't get very warm and probably near useless for drying hair but it works for this purpose.
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