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I am surprised the Coreflut Rappers have not made an appearance in this thread.
Just on the hairdryer use, those 12V ones do suck the juice out of a battery pretty quick and jumpstart packs have no staying power, usually only about 17ah for a quick surge for starters. A regular AC hair dryer is ok but turn the heat setting as low as possible and only use it for a few seconds to debug. Neither of those devices is a good solution for a night of imaging, where a good dew controller, like the Kendrick Astro one and the right dew strap, will keep your objective clear. Forget foil, it is fine for baked potatoes in an oven but useless in astronomy, as it is thin and sheds heat rapidly.
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