The Rolleiflex 2.8A model K7A of 1950 is the first one with the larger aperture Zeiss Opton Tessar taking lens and a Heidoscop viewing lens.
The first version uses a Compur Rapid X shutter with speeds of 1 - 1/400 sec., B, X-sync. But does not have M-sync. The second version released a year later in 1951 uses Compur Rapid MX shutter with speeds of 1 - 1/500 sec., B, M-X-sync. Bay II filter are used.
Production : from 1949 to 1951, about 9.870 units. Almost entirely sold to the USA. Format : 12 exposures of 6 x 6 cm on 120 type rollfilm. Furthermore a Plate adapter for sheet film and a Rolleikin adapter for 35mm film cartridges can be used.
Lens: Carl Zeiss Jena Tessar 1:2.8 f=80mm, coated. or : Zeiss Oberkochen Opton Tessar 1:2.8 f=80mm, coated. Viewing lens: O.A.S. Heidoscop-Anastigmat 1:2.8 f=80mm, coated Filter Bayonet : Both lenses, size 2. Parallax error correction. Shutter: Compur-Rapid X CR0 leafshutter. Speeds 1 to 1/400 sec.(later to 1/500 sec.) and B.
Flash synchronization : Sync socket on frontpanel. X synchronization, later also M-synchronization. Selftimer Double exposure prevention Color Lacquer : Black Color Leatherette : Black Dimensions WxDxH: 94 x 104 x 143 mm Weight: 1080 grams