The Pentax 6x7 is a SLR medium format system film camera for 120 and 220 film made by Pentax. It originally debuted in 1965 as a prototype dubbed the Pentax 220. Since then and with improvements, it was released in 1969 as the Asahi Pentax 6×7, as well as the Honeywell Pentax 6×7 for the North American import market. It would later receive a number of engineering updates and cosmetic changes and be renamed as the Pentax 67. The camera resembles a traditional 35 mm SLR camera with interchangeable viewfinder and lens, but is considerably bigger and heavier, weighing 2.3 kilograms (5.1 lb) with the plain prism and standard (105 mm f/2.4) lens. It is perhaps inspired by the 1957 East German 6×6 KW Praktisix and its successor, the Pentacon Six, although the horizontal SLR concept can be traced back to the 1933 Ihagee VP Exakta.