Kipon releases two Mamiya 645 to Sony E mount adapters with electronic aperture control: Digital Photography Review
FotodioX Adapter for Mamiya 645 Lens to Sony NEX M645-SNYE-PRO
Baveyes M645-S/E 0.7x Pro Lock Style Version - KIPON
Amazon.com : Fotodiox Pro TLT ROKR - Tilt/Shift Lens Mount Adapter for Mamiya 645 (M645) Mount Lenses to Sony Alpha E-Mount Mirrorless Camera Body : Electronics
Baveyes Adapter Mamiya 645 to Sony E (0.7x) | WALIMEX-WEBSHOP.COM - walimex-webshop.com
M645-NEX For Mamiya 645 Lens to NEX E Mount NEX A5100 A6000 NEX-6 A7 Adapter | eBay