When in the LV screen, you can see ISO, Shutter Speed and f-stop at the bottom. The four hard buttons work like this:
- Top Left: Exits LV like it always did
- Bottom Left: Cycles between ISO, Shutter Speed and f-Stop
- Top Right: Increases the value
- Bottom Right: Decreases the value
Edit: You see ISO, Shutter Speed and f-stop at the bottom AFTER you press the Bottom Left button one time, or tap anywhere on the screen while in LV.
This applies to any dumb (non-XT) technical camera; I have no idea if it works the same way when connected to the XT or XF. I've been using LV in Simulated Exposure Mode, which usually gets me close enough to the correct exposure. Takes some practice, and I do still use the heat map after to fine tune subsequent exposure adjustments. Obviously changing the f-stop only changes it in the meta data. I still find that useful to enter correctly since it impacts Diffraction Correction in C1. I rarely (if ever) change f-stop for exposure reasons, but it does remind me to make sure the metadata is correct.
Dave