Originally posted by vrrattko well check out OP's location - lillestrom....that's norway.....-17 is like refreshing for Norwegians
okay seriously - two tips - keep batteries warm ....and on return put camera in plastic bag and wait hour or so till you pull it out....
Try and suck as much air as you can out of the bag, and keep it sealed. If you have some, put silica gel pouches in the bag, or dry rice, which is said to also absorb moisture.
Ideally, try and move the camera/lens slowly through a number of increasingly warmer environments; it's the extreme change in temperature you want to avoid.