Hasselblad on Twitter: "The XH Lens Adapter can be used to mount an HC or HCD Lens onto your X1D or X1D II. The XH Lens Adapter widens your XCD Lens choices
Hasselblad's new XH Converter 0.8 reduces focal length, changes aperture of HC/HCD lenses on X system cameras: Digital Photography Review
Hasselblad XV Lens Adapter Announced For Hasselblad X1D