Dating hasselblad backs
The German optics industry had recovered by that time and as a cost-cutting measure, Hasselblad offered the Zeiss Tessar 80mm as the standard lens in Europe, along with other Zeiss wide-angle and telephoto lenses. S., they released the cameras with the Kodak Ektar or Zeiss lenses.
Unfortunately, the shutter mechanism of the 1000F was still delicate and many photographers shied away from it.
Hasselblad de-tuned the shutter and released the 1000F in 1952 with a top-speed of 1/1000 sec.(and it had limitations to its maximum aperture as well).The slow top-shutter speed limited the usefulness of the 500 series outdoors as a field camera.These had wider apertures and closer focusing than the leaf-shutter lenses, the C lenses.Several years later in 1982, the C lenses themselves were redesigned and renamed CF lenses in recognition that they could be used in both 500C and 2000FC bodies.