The earlier advice that the Auto Up attachment is not good for portraiture is incorrect! I don't believe the advisor has ever
used one. They are quite rare.
The Auto Up is a superior device for portraits on the 100/3.5 lens. I often use it with a 100/3.5 AE lens.
I use one all the time, and shoot outside the focus minimum of 1.5 meters - not exactly macro range. They are great for
6X9 environmental portraits, depicting the subject's shoulders and head easily. You can also get in closer if desired.
There is no distortion, as suggested and the image quality is wonderful, supporting substantial enlargements - my most
frequent size off 6X9 negatives is 12" X 18".
Finding an Auto Up is another story!
I speak from experience with Fujica medium format cameras, as I have all the 670, 680, and 690 cameras, as well as all the lenses - and yes, 2 Auto Up devices, which I searched world wide to secure. Much of my Fujica equipment came from Australia and Japan.
BTW - the Auto Up could be used for macro work on one of the Fujica tele lenses, but was intended originally as a studio portrait lens on the 100/3.5 AE, according to the original manuals and literature I have.
I will also mention the Rittreck/Warner/ Norita/Graflex Norita 66 cameras as excellent for portraits using the 80/2 lens. My first equipment from this group originally came from Spain some years ago, and I collect it at this point. The rarest parts of these are the late, and very limited production, Multi- Coated lenses - even rarer than the Fujica Auto Up.
JK