Nikon D780 DSLR Camera (Body Only) - Manual (Page 220)

174 Shooting Settings
3
Recompose the photograph.
Keeping the A button pressed,
recompose the photograph and
shoot.
A Metered Area
In [ Spot metering ] ( 0 166), exposure will be locked at the value metered
in a circle centered on the selected focus point. In [ Center-weighted
metering ], exposure will be locked at the value metered in a 12-mm circle
in the center of the viewfinder.
A Adjusting Shutter Speed and Aperture
While exposure lock is in effect, the following settings can be adjusted
without altering the metered value for exposure:
• The new values can be confirmed in the viewfinder and control panel.
• Note that metering cannot be changed while exposure lock is in effect.
Mode Setting
P Shutter speed and aperture (flexible program; 0 109)
S Shutter speed
A Aperture