There are no real hard set rules on what f-stop should be used for portraits, same applies to focal length used. While there are what is considered "professional" standards of portraiture, is this the look and image goal you're after?
As for wide angle portraits, this rather famous cat lady fight scene from Clock Work Orange was made using a 9.8mm Kinoptik Tegea. Stanley Kubrick applied this wide angle lens to this scene very, very, very effectively. The resulting images are very much portraits in motion. As for f-stop used in this scene, the 9.8mm Kinoptik Tegea has a full aperture of T2.3 or f1.8, what aperture might have been used for this scene?
https://www.youtube.com/watch?v=jjlq92tQHVk
I'm not convinced portraits made using a view camera should be limited to what tradition has dictated, other portraits methods should be considered from other imaging media including film, video, painting and more... Some can be adapted to view camera images, others cannot.
It all goes back to your print image goals, once this is mostly established, figuring how to achieve it can begin.
Bernice
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