Just thought i'd share this with u....
Went trekking with my older son, and his group of army friends all crazy about photography to nepal. We were at the base camp of one of the (donno what funny name) mountains, when i noticed that the temperatures dropped to -20 Celcius. At night, a storm hit, which dropped the temperature further to -25 to -28 requiring EVERYPART of your body to be covered... my D1x dieded (battery, and didn't want to risk freezing it further), Son's friend's canon 1d mk 2 dieded with the sensor apparantly getting FROSTED over with his 17-40L aperture stuck... :cry: and all remaining point and shoots not working.
Nonetheless, the trip turned out quite bad due to the storm which saw almost ALL of our group's 30 over cameras kicking the bucket.
I think it's worth mentioning that the only cameras to survive up to the 3rd camp were these ones: My backup F4s, a F5 belonging to someone else, an RTS III, a venerable OM-1 & AE-1 and a disposable kodak 35mm :lovegrin:
Cameras within our group that passed away (battery issues, circuits, etc)
Nikon: 1x, d100, d70, n80
Canon: 1d mk 2, 10d, elan, f1n(dropped it), eos 1v. (stuck mirror) and my son's eos 5.
I think most imptly, carry spare batteries, and if your camera offers u the chance of using normal batteries OVER the lithium ones, USE IT, as the lithium batts have low voltages which cause them to discharge rapidly in cold weather. Keep the cameras UNDER your jacket, and use heat packs in your camera bag.
Also, as mentioned above in another post, snow becomes WATER when it falls on your lense/camera depending on the temperature. So, be careful... seen a work partner of mine get h20 inside his L lense when he chionged to take pictures of a ski event without lense "clothing."
Need more advice, pm me k?
Good luck