I normally set up and take everything (scope, mount, cameras) down each night when I am imaging, but I have lately been trying to leave everything set up when I have a stretch of several clear nights in a row. When I do this I power everything down and cover everything with a nylon tarp. The only thing I bring back inside the house is my laptop. Are there any concerns about leaving the unpowered cameras out over night (premature dessicant saturation for example) ? The temperatures here in Southeast Texas will get down around freezing or slightly below. Humidity is very high and the dew gets pretty heavy.