What kind of "portrait" _?_
Head/shoulder, full length, 3/4 length, 1/2 length, couple, group, environmental or _?_
Contrast rendition (high or low), "sharp" or Soft Focus _?_
All in the image perceived to be sharp (smaller exposure aperture), selective focus (large to full lens exposure aperture) or _?_
All above and more applies directly to focal length needed for a specific film format size..
What about into out of focus rendition, would this be of any significance to the image goals?
Once the lens that meets specific portrait goals, then a lens choice could be made.. and the view camera better be able to extract the best out of that lens and properly support the specific lens to properly accomplish the portrait goals.. Or why camera choice is driven by image goals, then lens needed to accomplish these goals. Making the focus on camera alone is not wise.
~None of the above can be properly answered until plenty of portrait images have been made-produced as it is essentially to develop a sense for how LF view camera portraits are made. Only with much experience, mistakes, success and more is gained could choices knowing what is needed can be made. Get a view camera outfit, make images.. it's the only way to learn how to view camera as the gear can never make images on their own.
Bernice
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