Summary
This article describes how to physically modify Mamiya C lenses to work with the Phase One XF camera
In-Depth
With the introduction of the Phase One 645XF camera, Phase One also introduces an extended set of signal pins for communicating with lenses. This is there in order to offer new functionality in the future. The new subset of pins can be seen in Fig1 as the bottom row of pins.
What is a “Mamiya C lens”?
Mamiya has made a range of mechanical lenses over the years for such cameras as 645Super, 645PRO, 645PRO TL etc. Some of the lenses are specialty lenses which still are quite popular to use. In this document the lens used as example is “Mamiya 80mm F/1.9”
What is the difference from a Mamiya AF, Phase One AF or Schneider LS lens compared to Mamiya C lens?
On the Mamiya C lens there is a bayonet ring which goes inward in the bayonet fitting which is not the case on any of the more modern AF range. This ring prevents the mounting of the lens due to the new extended signal pin set.
Will Phase One and / or Mamiya Digital Imaging provide this modification?
No. Nor Phase One or Mamiya Digital Imaging will provide this service. This document simply outlines the necessary procedure in order to gain functionality. Please read disclaimer at the end of the document.
What modifications are required on order for a Mamiya C lens to work on a Phase One 645XF?
In order for the Mamiya C lens to work, then bayonet ring has to be slightly modified on order to accommodate the new signal pin set. To modify it, first remove the bayonet ring from the lens which is screwed on. (Fig 3 below)
Then the part painted in red in (Fig 4) will have to be removed. We recommend this to be done by a professional expert.
Once done, simply assemble the lens again and it can now be used on the Phase One 645XF.
Disclaimer:
No Warranties: All of the information provided in this document is provided "AS-IS" and with No warranties. No express or implied warranties of any type, including for example implied warranties of merchantability or fitness for a particular purpose, are made with respect to the information, or any use of the information, in this document. Phase One and / or Mamiya Digital Imaging makes no representations and extends no warranties of any type as to the accuracy or completeness of any information or content of this document. Disclaimer of liability: Phase One and / or Mamiya Digital Imaging specifically disclaims liability. For incidental or consequential damages. and assumes no responsibility or liability for any loss or damage suffered by any person and / or product as a result of the use or misuse of any of the information or content of this document. Phase One and / or Mamiya Digital Imaging assumes or undertakes no liability for any loss or damage suffered as a result of the use, misuse or reliance on the information and content of this document.