What only a few people seem to know is that printed circuitboards, along with their components but excluding the connectors, are "painted" with epoxy or silicon coatings to make them pretty impervious to moisture. Salt water will destroy it because it will short-circuit all the connectors, but simple condensations shouldn't kill it right away.
I know this because I have a client that develops these machines to kind-a spray paint circuitboards, even on low production numbers.
They can spray at high speed but with extraordinary accuracy (>0,1mm e.g.).
I know epoxy, silicon and PU are used, but there should be lots of other chemistries that they can use.
It doesn't waterproof your camera neither does it waterproof your lenses, but it does make the electronics a whole lot better suited for every day and or outdoor use.