Autoexposure Lock - Nikon D3100 User Manual

Autoexposure Lock

Use autoexposure lock to recompose photographs after metering exposure:
1
Set metering to M or N (0 79).
L will not produce the desired results. Note that
autoexposure lock is not available in i or j mode.
2
Lock exposure.
Position the subject in the selected focus point and press
the shutter-release button halfway. With the shutter-
release button pressed halfway and the subject positioned
in the focus point, press the AE-L/AF-L button to lock focus
and exposure.
While exposure lock is in effect, an AE-L indicator will
appear in the viewfinder.
t
3
Recompose the photograph.
Keeping the AE-L/AF-L button pressed, recompose the photograph and shoot.
A
The Shooting Menu
Metering can also be adjusted using the Metering option in the
shooting menu (0 131).
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:
Mode
Programmed auto
Shutter-priority auto
Aperture-priority auto
The metering method itself can not be changed while exposure lock is in effect.
A
See Also
If On is selected for Buttons > AE lock in the setup menu (0 146), exposure will lock when
the shutter-release button is pressed halfway. For information on changing the role of the
AE-L/AF-L button, see Buttons > AE-L/AF-L button.
80
Shutter speed and aperture (flexible program; 0 74)
Shutter speed
Aperture
Shutter-release
AE-L/AF-L button
Setting
button