For more than a decade, cinematographer Wally Pfister brought director Christopher Nolan’s cinematic visions to life. Now, he’s the one calling the shots. His directorial debut, the new sci-fi mystery “Transcendence”, has many elements of a Nolan blockbuster — eye-popping visual effects, a mind-bending story and an A-list lead in Johnny Depp. All of those things translate into high expectations for Pfister, who jokingly likens his newly christened director’s seat to an “electric chair.” In the film releasing Friday, the mind of Depp’s terminally ill scientist, Will Caster, is uploaded into a computer after his death, spawning an eerily unruly machine. At the heart of the story is the disrupted relationship of Will and his wife, Evelyn, played by Rebecca Hall.