A twin-lens reflex camera made by the German company Franke and Heidecke, later Rollei, in Braunschweig. The first Rolleiflex appeared in 1929.
It uses 120 roll film for square 6 x 6 cm images. The Rolleiflex was popular with reporters, portraitists and street photographers. Vivian Maier made much of her work with one.