
Canon field tester Ole Jorgen Liodden took a Canon 1Ds Mark III, a Canon 5D Mark II, and a Canon 7D to Antarctica to do some field testing and all three came out on top, handling the weather and the extreme temperatures just fine.
Because I am an owner of a Canon 7D, I was most delighted to hear that the 7D is built so well and weather sealed so tightly that even extreme cold and exposure to lots of moisture won’t stop the camera from taking photos. Now to only buy a lens that’s weather sealed as well…$$$$$$$.