Nikon D780 DSLR Camera (Body Only) - Manual (Page 157)

111 Shooting Settings
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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 adjust
aperture, rotate the sub-command dial
while the exposure meters are on.
• Aperture can be set to values between the minimum and
maximum values for the lens.