Dave: I like you man, was glad to see you on the Kodachrome forums now and then, but my friend, what is up with all the gear centric posts lately? You know for a fact that gear has very little to do with a making a great image. That is why I am always scratching my head when someone posts "M9 does Paris" when it is the photographer who brought the camera to France and to his or her eye in order to make the image.
I shoot over 100 days a year in the dead of Winter in temps ranging from a balmy 40 degrees to -30 plus a massive windchill, usually associated with helicopter downdraft. The range of altitudes are 8,000-19,000 feet. Case in point, last year the temp was -82.
I have used Leica, Hasselblad, XPan, Nikon, Canon all in these conditions without fail due to a professional approach to using them. A good friend of mine who I did a New York Times piece on this year used his 5D-II, 24-105 and 14 2.8 without fail on
Everest back in May, again, a professional using professional approaches in out of the ordinary climates...
I used my M6 when doing a very cold vertical ice climb of Mt. Rainier in 2008. I used a Nikon FM3A when doing the last 4 climbs of the 54 Colorado 14,000 foot peaks in 2007. I used a D3 on that day in the helicopter with the door off at 16,000 feet at -82 windchill.
It's not the gear at all man, it is the photographer and only the photographer and the title should read "Heat got you down? Photographer goes to the edge of the of the earth", not a camera....
And I feel bad for the rest of the country, I live and work at 8,000++ feet and have not even seen 90 degrees this year, that climate would kill me like it would a polar bear...