Alan, I would consider somewhere 240mm focal length esp. for portrait considering the maximum extension of 350mm.
As of the math of the bellows extension, check the site below. Nice explanation from Ken too.
https://ilovetheoutdoors.zenfolio.co...up-photography
I would consider from the followings.
modern lenses:
Fuji Fujinon A 240mm f9
Fuji Fujinon CM-W 250mm f6.3
Nikon Nikkor W 240mm f5.6
Rodenstock Apo sironar S 240mm f5.6
Rodenstock Apo ronar 240mm f9
Schneider Apo symmar 240mm f5.6
Old lenses with shutters or in barrels and with round apertures:
kodak Commercial ektar 10” or Ilex Caltar/Paragon/Acutar/Acu-tessar 10”
schneider Xenar 240mm f3.5/4.5
old barrel lenses for portrait with fast and round apertures:
dallmeyer 2B 220mm f3
taylor hobson cooke IId f3.5/ IIe f4.5 270mm or 10 1/2”
zeiss jena tessar f3.5/4.5 250mm
voigtlander heliar 240mm f3.5/4.5
hugo meyer trioplan 260mm f3.5/4.5
and so on...
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