Hi Barry,
I think the Pentax with the QSI adapter route is looking ok, particularly as the image circle from a medium format lens will give me a flat field at close to wide open.
It's a 2.8 lens so probably working at f4.0 is ok - the lenses are in plentiful supply as almost no-one uses Pentax 6x7's professionally anymore.
Anyway- food for thought, see how you go and thanks for the input!
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