Where is the NPP on a Rokinon 8mm f/2.8? All the posts I can find about this point are for the f/3.5 fisheye lens, not the f/2.8 8mm.

I know that this point changes depending on the angle of incidence, which changes according to the number of shots. With this lens, which is better, 4 90 deg. shots, or 6 60 deg. shots? Is there a really appreciable difference between the two NPP, where a change in the lens ring setting is justified?

What is the NPP setting for Rokinon 8mm f/2.8 lens with ring clamp on upper rotator?