Originally debuting in 1965 as a prototype dubbed the Pentax 220. Since then and with improvements, it finally 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 few changes and dubbed the Pentax 67. It was a SLR medium format system cameras for 120 and 220 film. It resembles a traditional 35mm SLR camera with interchangeable viewfinder and lens, but is considerably bigger and heavier, weighing 2.3 kilograms (5.1 lb) with plain prism and standard lens; 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. The Pentax 6×7 has its own dual bayonet lens mount, and a wide range of interchangeable Takumar lenses exist. More than forty years after the original camera introduction a wide selection of lenses was still available, together with the latest Pentax 67II.
