Sorry, it's easy to get confused when there are so many vendors involved in one camera.
You're right Bob. And modular camera systems are inherently more complex and have more configuration/compatibility options and factors to consider, that's for sure.
But generally, with regard to the Mamiya/Phase One 645 system, Leaf and Phase One backs can be treated the same, but note there are generational differences. The below compatibility information covers digital back and camera systems dating back to 2001.
* Digital Back compatibility:
- Phase One XF: Phase One IQ Series or Leaf Credo
- Mamiya/Phase One DF/DF+: Leaf Valeo/Aptus/Aptus-II/Credo & Phase One P/P+/IQ Series
- Mamiya/Phase One AFD/AFD-II/AFD-III: Leaf Valeo/Aptus/Aptus-II & Phase One P/P+
- There are also 3rd party adapters for 3rd party digital backs for Imacon/Hasselblad, Sinar, Jenoptik, etc, for AFD (and I think) DF/DF+.
* Film Back compatibility:
- Phase One XF, Mamiya/Phase One DF/DF+: Not compatible
- Mamiya Phase One AFD: Yes compatible
* Lenses
- Phase One XF, Mamiya/Phase One DF/DF+: Schneider-Kreuznach, Mamiya/Phase One D Series, Mamiya AF (some may require a firmware update), Mamiya Manual Focus (most manual focus will require modification for XF), Hasselblad V and Pentacon (with adapter)
- Mamiya/Phase One AFD Series: Mamiya/Phase One D Lenses, Mamiya AF Lenses (some may require a firmware update), Mamiya Manual Focus Lenses, Hasselblad V and Pentacon Lenses (with adapter)
Steve Hendrix/CI