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This is worth some more research, on my part and others. My guess is you can either warm the area around a scope or warm the scope itself,or cool an area near a scope to act as a dew syphon! This last point may be interesting, if one places rough metal tubing with alot of surface area near your scope will this act as a syphon to radically drain moisture out of the air before it ever reaches your scope?
Dew
Dew is moisture that condenses at the ground level. The layer of air within about a metre above the ground experiences rapid changes in temperature from day to night. Therefore the temperature may be cooler on the ground than the air above. Consequently, the air temperature close to the ground may cool to below the level needed for condensation. Moisture therefore is observed on grass and on the surface of some objects such as those with metal surfaces. If the air above also cools below the condensation level, fog will form.
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