Nikon D810 - Manual (Page 342)

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Use this option to fine-tune the exposure value selected by the
camera. Exposure can be fine-tuned separately for each
metering method by from +1 to –1 EV in steps of
1 /
6
EV.
b7: Fine-Tune Optimal Exposure
G
button ➜ A Custom Settings menu
D
Fine-Tuning Exposure
Exposure can be fine-tuned separately for each Custom Settings bank
and is not affected by two-button resets. Note that as the exposure
compensation (E) icon is not displayed, the only way to determine
how much exposure has been altered is to view the amount in the fine-
tuning menu. Exposure compensation (0 130) is preferred in most
situations.