'Dunkirk' Director Christopher Nolan Explains the Challenges of Shooting on IMAX

Christopher Nolan breaks down the difficulties in shooting on IMax film with such a massive production. 'Dunkirk' starring Tom Hardy, Cillian Murphy, Kenneth Branagh, Mark Rylance, Fionn Whitehead, Harry Styles, and directed by Christopher Nolan hits theaters July 21st, 2017.