The Rolleiflex TLR (Twin Lens Reflex) cameras were manufactured by Franke & Heidecke in Germany, with the first model introduced in 1929. These cameras use 120 roll film to produce 6x6 cm square images. The Rolleiflex TLR features a dual-lens system: one lens for viewing and focusing, and another for taking the photograph, both typically Carl Zeiss or Schneider lenses. Key technical specifications include a leaf shutter (usually Compur or Synchro-Compur) with speeds up to 1/500s, waist-level viewfinder, and manual focus via a ground glass screen. Notable features include automatic film advance with frame counter, parallax compensation, and high build quality. The Rolleiflex TLR series is renowned for its sharp optics and was widely used by professional photographers.