The Mamiya 180-411 Sliding Adapter with Mamiya 645 Mount is made to interface with the rear of the VX23D camera, allowing you to first view and then capture an image with digital backs made to fit the Mamiya 645 mount cameras. One one side of the back is a conventional ground glass, and on the other side is the fittings for the Mamiya-645-specific digital back of your choosing.
You would use this sliding adapter for any back which does not offer live view focusing from the image sensor.
Sliding function adapter exclusively for the VX23D cameras
Ground glass viewing aside fitted back specific to the Mamiya 645 mount