Nikon Z8 User Manual page 608

High-Frequency Flicker Reduction
Selecting [On (shutter speed fine-tuning)] allows shutter speeds between ¹⁄₈₀₀₀ and ¹⁄₃₀ s to be
adjusted in smaller increments in mode M, letting speeds that keep flicker to a minimum be found by
viewing the preview in the shooting display. More information is available in the section devoted to the
[High-frequency flicker reduction] item in the photo shooting menu (
G button U 1 video recording menu
534
459).
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High-Frequency Flicker Reduction