Interesting stuff about The Revenant :
Shot using only natural light by Iñárritu’s Oscar-winning cinematographer Emmanuel Lubezki (Gravity, Birdman), the production was on location in Calgary for months, combating limited shooting hours and brutal weather conditions only to run out of snow at the end. The uncooperative weather means the production, which also includes Tom Hardy (Mad Max: Fury Road), Domhnall Gleeson (Ex Machina) and Will Poulter (The Maze Runner) will gear up in Gortex again to conclude production on Argentina’s southern-most tip in a mad dash to complete the film by Christmas Day.