This Horseman LD Pro Series Mounting Plate for Mamiya 645 Digital Backs fits between their #23151 LD Pro camera and Mamiya's digital camera backs made to fit the 645AFD/645AFDII cameras, such as the ZDB-22. This allows a lens-to-back flange minimum distance of just 33mm, or even 20mm with a recessed lensboard; and your tilt axes stay within the confines of the digital back with the LD Pro.