I'm traveling to Fairbanks in February to shoot the Aurora Borealis (fingers crossed). It's been on the bucket list for a while, so we decided to just go for it. I'll be taking my A9 and a couple of wide angle lenses, and of course my tripod for those long exposures. I have lots of extra batteries and the "tough" cards to deal with the extreme cold. I know to keep the batteries in my pocket, in an inner layer or near hand warmers, but I'm wondering if there's anything I need to do to make sure my camera body and lens stay functional hanging out on the tripod?