Kipon has released a pair of Mamiya 645 medium format lens adapters with electronic contacts for aperture control on Sony E-Mount cameras:

Kipon M645-S/E E ($289 from Amazon) adapts Mamiya brand Mamiya 645 mount lenses to Sony E mount cameras with aperture control from the camera body.

Kipon M645-S/E ES ($389 from Amazon) adapts Phase One or Schneider brand Mamiya 645 lenses to Sony E mount cameras with aperture control from the camera body.

The two adapters are constructed of aluminum and brass, offer infinity focus andelectronic aperture control through the camera. A previous Mamiya 645 to Sony E mount adapter has been available for some time, but it doesn’t offer the electronic contacts for aperture control and features a less pleasing design.