As far as I understand, when not mounted, Nikkor (G) lenses close their apertures down to the smallest; as for Canon (EF) lenses, its the other way round, with their apertures wide open.
Manual focusing for me is okay, but does it allow us to set the f-stop whether with or without the chip? If it were to be f/22 all the way, it'd be pointless. :dunno: