Kirsten Johnson’s 25-year career as a documentary film cinematographer has taken her around the world, often to regions of conflict. Her own film, Cameraperson , is a memoir of her life’s work assembled from a collage of cutting-room-floor footage. It’s also a keen examination of the dilemmas and blind spots that riddle documentary filmmaking. Johnson joins us Monday as we continue our Through the Lens series on documentary film with an exploration of what it’s like to be behind the camera.