Nikon D5 - Manual (Page 157)

135
Z
A : Aperture-Priority Auto
In aperture-priority auto, you choose the aperture while the
camera automatically selects the shutter speed that will produce
the optimal exposure.
To choose an aperture
between the minimum and
maximum values for the lens,
rotate the sub-command dial
while the exposure meters are
on. Aperture can be locked at
the selected setting (
0 140).
A
Non-CPU Lenses ( 0 324, 326)
Use the lens aperture ring to adjust aperture.
If the maximum aperture of the lens has been
specified using the Non-CPU lens data item
in setup menu (
0 244) when a non-CPU lens is
attached, the current f-number will be
displayed in the viewfinder and top control
panel, rounded to the nearest full stop.
Otherwise the aperture displays will show only the number of stops (F,
with maximum aperture displayed as F
A) and the f-number must be
read from the lens aperture ring.
Sub-command dial