I am generally a lazy person, so I am extremely averse to changing lenses on my camera in the cold. I am concerned about my fingers getting cold, but here I read that condensation is extremely dangerous for my camera in cold weather conditions. I understand that condensation occurs when I take my camera from cold air into a warm house, and moisture collects on the lenses. This moisture can harm the interior of the camera, as water does harm to electronics. Besides, water drops can freeze if I leave the warm building for the outside again, so a common advice is to pack the camera into an air-proof bag.
Now, if I am shooting outside, is the camera interior air-proof? Is the air inside the lens and near the sensor warm? Is it dangerous to open the compartment and change lenses outside? How am I supposed to change lens when shooting outside in winter?