Sony FX 6 Quick Start Manual page 117

Cine EI: EI Presets and Overexposure
When working with all Sony cameras, you can always slightly overexpose
Slog 3 images but you never want to underexpose them.
Overexposing slightly can diminish image noise, since it increases the
shadow luminance range, or pushes the image information out of the image
shadow areas that have the most noise.
Overexposing using the EI Presets is most useful when working in Base High
Sensitivity 12800 ISO. There will be some image noise so they may benefit
from being slightly overexposed. Don't lower the ISO below the lowest
recommended preset value: 3200 ISO.
Images exposed at the Base Low Sensitivity (800 ISO) have very little noise
and generally will not need a different EI preset value.