This is the reply I just got from MAC on this issue just this morning:
Ken,
Yes the 75-150 can be used with the AFD Series.
Regards,
Anthony Pak
MAC Group
8 Westchester Plaza
Elmsford, NY 10523
(914) 347-3300
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(emphasis is mine)
This is the same Question/issue that I've asked before but never got a definitive answer regarding the AFD body, 75-150, and a MFDB.
I'm not sure why B&H Photo and other retailers have a somewhat confusing statement about the 75-150 being able to be used with the 645AFD and a film back only.
Perhaps less exif information is conveyed to the digital back? I really don't care, as long as I can use the 75-150 on the AFD with a P30 back.
Ken