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I have found that the heater will keep my ES30 clear quite well, though it does need to be cranked up, as Alexander wrote, the EP body, tube and scope itself is a very effective heatsink.
I should arrange an eyepiece box heater, I wonder about a terrarium heater pad fitted under the pick and pluck foam. Something running off 12V would be ideal as I have that on hand via a PSU with about 6A capacity to spare.
The EP heater was the difference between being able to use my old Nagler 11mm and leaving it in the box, it dewed up even more readily than my SCT does.
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