[/quote]The Phase one cameras, I believe, use the Mamiya 645 lens mount, and lenses are made by a third party. [/quote]
FYI…. PHASE 1 does use the Mamiya lens mount and all Mamiya lens’s are made by Mamiya. Unless their culture has changed recently, Mamiya make every component in their lens, including the lens blanks, grinding, polishing and coating. I have been a Mamiya user since 1966 and this has always been the case. There is now a business relationship between Mamiya, Phase 1, Leaf and Schneider. I would love to have a MF digital back made by Canon with their current technology.