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Keeping eyepieces dew-free
Also, another option is to keep your EPs in a container of sorts (a case) or even a small portable cooler - a mini-ice chest - into which you set your EPs for the night, and drop in one or two of those chemical warm pacs wrapped in a small towel. Keep the lid on the case between EP changes, and the contents - including the EPs - will stay warm enough to prevent dew. Of course, if that EP stays out for a long time, it can still cool and dew up, in which case the above mentioned solutions are the best. EPs heaters, focuser warmers, etc.
I've a Pelican case for mine and have been considering installing a low-temp heating element in the bottom for such a purpose. They sell them at Kendrick...case heaters...for that same purpose.
Common problem I have when in the northern US is not dew per se, but condensation when my warm face approaches the freezing-cold EP: fogs up right away and is slow to resolve. less of an issue here, but in Wisconsin...hardy observers have been known to have damp eyelashes freeze solid to the (ice-cold) barrel of the EP, and require extrication by a partner. Another good reason to observe with a buddy, preferably one with a small hair dryer...or small scissors....
Scott
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