Just curious...what's the advantage to using a given digital back on an RZ67 vs a 645AF? You lose autofocus and portability, and you get a smaller choice of lenses (many of which are slower).
Are the RZ lenses that much sharper? Usually it seems people claim larger format lenses are LESS sharp, but perhaps in this instance, that's not the case...particularly since you are using a severely cropped central portion of the lens?
I have both systems and some good 645 lenses. Not that I'll ever find an RZ67 digital back adapter that costs less than my entire RZ setup, but I figured I'd ask just in case.