The RZ67 Has a Focusing System which Uses Bellows Extension to Focus the Lens
This System Allows You to Focus Closer to the Subject and to Shoot at Macro Distances with Most of the Mamiya Lenses, Even if they Are Not Labelled “Macro”
The Extension of the Bellows Is Limited to the Maximum of its Possibilities and the Minimum Focusing Distance then Depends on each Lens
If You Want to Take Pictures Closer than That, You Need Extension Tubes
The Extension Tubes Enhance the Possibilities Much Further
Mamiya Suggests that You Cannot Use the 50mm, the 37mm, the 75mm Shift, the Zoom 100-200mm and the 500mm with the Extension Tubes.