So I documented myself on Sunny 16 to shoot on 35mm film, mostly Kodak Portra 400.
All the videos or articles I read mention that the Sunny 16 is basically setting the camera's settings at 1/250 if you have 200 ISO film (so 1/film_speed) and f16 if it's very sunny with sharp shadow edges, f11 with sunny with softer shadow edges etc.
However and here comes my question, it seems they explain it the same way with all ISO film speeds and just change the 1/film_speed formula to the film speed. So in the formula above, everything would be the same except 1/500 if you have 400 ISO film in the camera etc.
Therefore, how can I take into account and visualise in my sunny 16 evaluations with different ISOs, for example if I have 400 ISO film speed?