Nikon D500 Professional Technical Manual page 26

Flicker Reduction
The Photo Shooting Menu Flicker Reduction Option
Flicker reduction can detect flicker at 100 and 120 Hz (associ-
ated respectively with AC power supplies of 50 and 60 Hz).
Flicker may not be detected or the desired results may not
be achieved with dark backgrounds, bright light sources, or
decorative lighting displays and other non-standard light-
ing. Depending on the light source, there may be a slight
delay before the shutter is released. During burst shooting,
the frame rate may slow or become erratic; in addition, the
desired results may not be achieved if the frequency of the
power supply changes during shooting.
Flicker detection will not take effect at shutter speeds slower
than / s (including Bulb and Time) or when M is selected
1
UP
100
for release mode or exposure delay mode is on. Flicker de-
tection is available during flash photography but can not be
used with remote wireless flash units.
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