I am pretty sure the Canon 1Dx series camera and most L series lenses can withstand the cold weather. Other prosumer grade like 5D, 6D and 7D series may too. I took my 5D II with two lenses, 17-40 and 24-105, to Fairbank and Arctic Circle in Alaska, and another trip to Iceland, all in lower than minus 35 degrees. I had no problem at all. Just make sure you have extra batteries with you and keep them warm, do not change lens outside, put your gear in a plastic bag before entering warm places to keep condensation forming on your gear and most importantly, keep yourself warm. Hope this helps.