Keep in mind that the Apo-Nikkors won't increase much their coverage with stopping down.
The older generation are tessars, the newer ones dialytes.
The former ones get marginally better coverage with closer diaphragms, the latter ones would increase edge quality, not coverage.
Then you have diffraction problems, if you stop down too much.
Better to stick with "sweet spot" aperture with these lenses.
Unfortunately there are very few choices for those looking for extreme coverage (if you limit your choice to affordable repro lenses of modern vintage - coated!).
I have seen a few plasmats and dagors for graphic or scientific use, made in the USA.
Then there is the Schneider C-Claron 477mm, which should have gigantic coverage, and which is the only C-Claron made with diaphragm.
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