One more point - I don't generally use ACROS in MF because its not fine enough! Had
a friend using Tech Pan with very expensive Zeiss Rollei lenses (indeed better than my
Pentax 6X7 lenses), but he converted to Efke 25 once he saw what I was doing. But
optimized, under the very best of conditons, this allows only a rough approximation of
what 4x5 film with 400-speed TMY will get, provided you don't waste all the lens potential by stopping down too far due to lack of movements. Anything above 16x20
and MF is basically mush anyway. Maybe wide-angle lenses to 20X24; but 4X5 blows
away MF every single day of the week at that scale. Not all of us are carbon printers
(even if we envy your own abilities in that medium). I switch between color printing
and silver about 50/50. And in the case of color, it is indeed a Godzilla vs Bambi contest.