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The Pentacon Six and it's predecessor Practisix is a medium format film SLR system camera manufactured by KW later VEB Pentacon and Kombinat VEB Pentacon, Dresden, former East Germany and produced between 1957-90. Very well built, although, from my own experience, sometimes has problems with the film transfer.Here you can find more info about the camera's models and technical specifications.
Here is a list of the lenses with P6 bayonet mount: