Finite objective common camera optical adaptations

from Ichthyophthirius:

I:   Viewing (objective - ocular - human eye)
II:  Afocal (objective - ocular - camera lens - sensor)
III: Refocussing (not recommended)
IV:  Eyepiece projection
     (lifting eyepiece with unchanged intermediate image location O')
V:   Projective AKA photo relay (objective - relay optic - camera sensor)
     'hybrid' relay - Rolf Vossen
     Macro lens, instead of photo relay lens, focused at O'
     discussed under "Converting finite optics to infinity corrected"
VI:  (added) Direct projection (camera sensor at O')