LensRentals has loaned me a Nikon 58 mm f/0.95 Noct for testing. I tested for field flatness using Roger Cicala’s Ps>Filter>Stylize>Find Edges trick with the lens on a Z7 body wide open.
The scene:
The results at two distances:
The field is very flat. Some longitudinal chromatic aberration (LoCA) is visible.
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