I live in Russia and the country is affected by Global Warming: less severe frosts, unstable weather. I want to share my experience using a digiback in extrame cold. I just came from a business trip to Eastern Siberia, where the temperature was below –30 C. what is normal. One day we enjoyed the temperature about – 45C with very low humidity. I had my ALPA TC with the eMotion 22 and 35mm Digitar and used the set for snap shots outdoors. I had no problems with my e22 even at –45 C (I kept the battery in the pocket) . Alpa and Digitar 35mm behaved as expected, being left outside for a night (in a perforated plastic case) so they did not accumulate condensate. Everything changed when the temperature dropped below – 40 C. The shutter got frozen and became lazy. It still worked and I was able to synchronize the back and the lens.
Yevgeny