People like me who shot a lot of chrome film in the past simply got used to picking out scenes that matched the color and contrast parameters of a specific film. Actually printing what you get is a much more involved subject; but over time, if you do this a lot, you learn to see the world in that same manner not only your film does, but in harmony with your chosen print media itself. But chrome films have narrow latitude, and Velvia is especially narrow. With my spotmeter, I'd always read the highlights that I'd want to retain hue or texture in (versus pure white specular reflections etc), then the 18% midtone, and finally the shadows, if something was going to need to be sacrified there. But more often, I just avoided Velvia altogether in harsh lighting. Because I cut my teeth on Kodachrome, Velvia wasn't particularly difficult at all. And I'm grateful for having to learn strict discipline with this kind of exposure, because I take the same care even when
exposing color and black and white negs. I preferred the 100F version of this for a very simple reason: it was on a dimensionally stable
mylar base in sheet film. The 50 version was on unstable acetate and wouldn't maintain dimension in register with supplementary printing
masks.