Next month I’ll be in Northern Canada after polar bears and other wildlife and with luck maybe the northern lights. This will naturally require some periods (up to several hours) outside in below freezing temps (15-30 degrees F). Any advice on how to manage my SL2 and lenses under these conditions? I plan on taking a Sigma 150-600 Sport for reach and a Leica 24-70 for all around use. What do I need to watch out for equipment wise for the periods in the cold temps? It’s a heavy kit - would I be better off with the Leica 100-400 which is 1 pound lighter than the Sigma? How well do adapted m-lenses on the SL2 perform in the cold? Any and all advice will be appreciated.