"There is no way to electronically couple for the Contax lenses to stop down during exposure, and no way to even stop them down manually, as the lenses have a fully electronic interface. This quote from dpi forums explains it better than i do For adapting to a smaller (ff or apsc) format this would be less problematic as there would be quite a large difference in the registration distances there probably isn't room in the registration differences to support the adapter. The other issue here is the Contax lenses all have electronic controls and the electronics would need to be reverse engineered and the adapter would need to be large enough to support this.
the lens registration distance differences likely make the others not viable As far as i am aware the only cross mounts in Medium format to medium format are all from 6圆 or 6x7 lenses to 645.
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