Portrait photographer Elsa Dorfman found her medium in 1980: the larger-than-life Polaroid Land 20×24 camera. For the next thirty-five years she captured the “surfaces” of those who visited her Cambridge, Massachusetts studio: families, Beat poets, rock stars, and Harvard notables. As pictures begin to fade and her retirement looms, Dorfman gives Errol Morris an inside tour of her backyard archive in the movie The B-Side: Elsa Dorfman’s Portrait Photography.