Nikon D500 - Manual (Page 247)

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A
Optical AWL
Position the sensor windows on the remote flash units to pick up the
light from the master flash (particular care is required if the camera is
not mounted on a tripod). Be sure that direct light or strong reflections
from the remote flash units do not enter the camera lens (in TTL mode)
or the photocells on the remote flash units (
qA mode), as this may
interfere with exposure. To prevent low-intensity flashes emitted by
the master flash from appearing in photographs taken at short range,
choose low ISO sensitivities or small apertures (high f-numbers) or
rotate the flash head on the master flash to point upwards. After
positioning the remote flash units, take a test shot and view the results
in the camera monitor.
A Flash Compensation
The flash compensation value selected with the W (M) button and
sub-command dial is added to the flash compensation values selected
in the wireless flash options menu.
Y icons blink in the control panel
and viewfinder when a flash compensation value other than ±0 is
selected for the master or remote flash units in TTL or
qA mode.