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It is big, it is heavy, it is a beauty, it is a beast. It is very sharp and has the Schneider/Leica look. It is not so good at MFD wide open but great at longer distances. Capable of very thin DoF. There are 3 versions MF, AF and AFD. All are fully electronic and work only on the Rollei 6000 series, AFD only on Hy6/AFi.
There is also a 180/2.8 made by Carl Zeiss Jena for Pentacon Six.