Nikon D500 Menu Manual page 120

The functions that can be assigned to these controls are as
follows:
t
Power aperture (open)
q
Power aperture (close)
i
Exposure compensation +
h
Exposure compensation –
r
Index marking
s
View photo shooting info
B
AE/AF lock
C
AE lock only
E
AE lock (Hold)
F
AF lock only
C
Take photos
1
Record movies
None
The following options are available:
Option
Power aperture
t
(open)
Power aperture
q
(close)
120 Menu Guide
Option
Aperture widens while the Pv button is pressed.
Use in combination with Custom Setting g1
(Custom control assignment) > Fn1 button >
Power aperture (close) for button-controlled
aperture adjustment.
Aperture narrows while the Fn1 button is pressed.
Use in combination with Custom Setting g1
(Custom control assignment) > Preview button
> Power aperture (open) for button-controlled
aperture adjustment.
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