Probably won't work, but, an idea I have wondered about, get a box of dry ice, and feed the gas coming off it into the body of a camera.
I think the cold and dry gas should cool the camera, and with the gas flowing around the sensor, should keep ambient air, and its moisture, clear of the sensor - no condensation!
Possibly blow (or suck) air through the dry ice into the body (in-line fan) to get enough cooling.
Any moisture in the air will condense out before getting to the camera.
Philip
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