Sorry for coming in late.
To recap: the East German company Carl Zeiss Jena was not, as many was led to believe, a "fake" company bearing the name of Carl Zeiss to leech off the reputation of the name; it was the original company in the original factories where all the pre-WWII lenses were made. For that matter, the company name was "Carl Zeiss", as as per the custom of the time, the location of the company was also marked on the lens: in much the same way, the company who made the Leica lenses was not "Leitz Wetzlar" but "Leitz".
The US forces reached Jena first and according to the agreement reached at the Yalta conference, the US occupying forces would vacate for the Soviet forces to take over administration. Thus "Operation Paperclip" was put into action: several hundred Carl Zeiss personnels were "escorted" at gunpoint, along with a huge amount of material resources, to the area destined to be under US control, so that a new optical company could be established there. The Carl Zeiss company name was registered in a hurry, and so was the Carl Zeiss Foundation.
Meanwhile, the company in Jena was pretty much left in the cold but it still tried its best to get back into business, but as the original Carl Zeiss Stiftung re-registerred with the authorities a matter of days later than the new one in the west, it lost its legitimacy as seen in many overseas countries. In much the same way, Carl Zeiss Jena did that too, for not having the rights to the name it had been using since the latter days of the 19th century.
While East Germany manufactured cameras of many types. the original Zeiss Ikon company in Dresden took little time to shift from rangefinder cameras to single-lens reflex cameras, although for a number of years afterwards, Carl Zeiss Jena still produced lenses for the West German-made Contax IIa and IIIa cameras. But Carl Zess Jena had to satisfy the demans of domestic manufacturers of cameras and other markets too, so apart from specialist photographic optics (such as the Apo-Germinar process lenses), the photographic lenses it produces were for reflex cameras, made by Exakta and KW (which later became Pentacon).
Consider the two brands 35mm single-lens reflex cameras, Carl Zeiss Jena was one of the two main supplier of lenses to them, the other being Hugo Meyer. With the exception of some short-lived detours such as Praktina and Pentina, a staggering quantity of lenses were made in Exakta, Praktica M42 screw and Praktica B mounts; the B-mount ones were of course the last made and many of completely new designs. Using a M42-mount 35mm single-lens reflex would be a good way to access these Carl Zeiss lenses (along with the many fine Meyer ones too).
But back to the CRF topic: Carl Zeiss Jena, after the way, did produce a series of 35mm compact cameras called the Werra, of various specifications; the top model, thte Werramatic, featured exposure meter, coupled rangefinder, and three interchangeable lenses: 35mm Flektogon, 50mm Tessar and 100mm Cardinar, all very fine performers, and with a Prestor leaf shutter with rotating blades which could give a marked top speed of 1/750s (although it can indeed run at 1/1000s with ease.
