The 521/2 is a member in the long Ikonta line of a folding cameras, produced by the German company Zeiss Ikon. It takes 8 images size 6x9 cm on 120 type rollfilm and comes equipped with a variety of lenses and shutters. It was also sold as the Ikonta 21/4 x 31/4. Prewar known Lens/Shutter combinations are the Novar 4.5/11 cm lens in a Compur shutter, Novar 3.5/10.5 cm lens in a Compur or Compur-Rapid shutter, Tessar 4.5/10.5 cm lens in a Compur or Compur-Rapid shutter, and the Tessar 3.8/10.5 cm lens in a Compur or Compur-Rapid shutter. Postwar known Lens/Shutter combinations are the Novar 4.5/10.5 cm lens in a Klio shutter, Novar 4.5/105 mm lens in a Prontor-S shutter, Novar 3.5/105 mm lens in a Prontor-S shutter, and the Tessar 3.5/105 mm lens in a Compur-Rapid shutter. Only the postwar editions had flash synchronization using a Socket on shutter with X-synchronization. The camera had double exposure prevention incorporated in the film advance winder preventing the shutter release button to engage. This camera, like most Zeiss Ikon cameras, is black with chrome ornaments and black Leatherette covering. The dimensions folded are 155x81x43 mm and the weight is 680 grams without film. Other features are the two tripod sockets for landscape plus portrait, a flip-up two lens optical viewfinder, aperture settings of 3.5 to 22, 12 second self-timer, shutter release cable socket in the release button, octagonal red frame view window with slid cover on the back cover, flip-out foot for table top placement in the portrait acclimation, and a handy carry handle. The shutter on the 521/2 was manually loaded and the speeds on most are 1 second to 1/250 of a second plus B but these speeds depend on the lens/shutter combination. The 521/2 camera production started in 1938 but was stop during the WWII years and was continued in 1946 and stopped again a year later.