Stephen Sackur speaks to one of the world's most celebrated cinematographers, Roger Deakins. He has won Oscars for his work on 1917 and Blade Runner 2049, and also shaped the look of modern classics such as O Brother, Where Art Thou?, Skyfall, The Big Lebowski and The Shawshank Redemption. But is technology, from CGI to the ubiquitous camera phone, changing everything we thought we knew about making films?