Sony FX 6 Quick Start Manual page 112

Cine EI: Base Sensitivity and EI
When you are exposing Slog3 images with a LUT applied, it is easiest to keep
the EI preset at the same value as the base sensitivity ISO value.
In the image you can see that the Base High Sensitivity ISO and the EI preset
value are the same: 12800. However, you can make adjustments. Read on.
Base High ISO
EI Preset