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You can buy portable dew heater strips that wrap around the EP and keep it warm, they plug into a controller and run off a 12V battery source. I have dew-not strips for my scope and EPs and a Kendrick controller. You plug it in, flick the switch and dew is banished.
The other option is a battery operated hairdyer (I steal my wife's) - don't blast the EP at close range though, hold it back a ways! This only give you temporary relief from dew though.
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