Nikon D5100 - Manual (Page 87)

69
t
Autoexposure Lock
Use autoexposure lock to recompose photographs after using M (Center-weighted
metering) and N (Spot metering) to meter exposure; note that autoexposure lock is
not available in i or j mode.
1
Meter exposure.
Position the subject in the center of the frame
(center-weighted metering) or the selected
focus point (spot metering) and press the
shutter-release button halfway to set focus and
meter exposure. Check that the in-focus
indicator (
I) appears in the viewfinder.
2
Lock exposure.
With the shutter-release button pressed halfway and the
subject positioned in the focus point, press the AE-L/AF-L
button to lock exposure.
While exposure lock is in effect, an AE-L indicator will
appear in the viewfinder.
3
Recompose the photograph.
Keeping the AE-L/AF-L button pressed, recompose
the photograph and shoot.
A
Autoexposure Lock
If On is selected for Custom Setting c1 (Shutter-release
button AE-L;
0 159), 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 Custom Setting f2
(Assign AE-L/AF-L button;
0 166).
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 Setting
Programmed auto Shutter speed and aperture (flexible program; 0 62)
Shutter-priority auto Shutter speed
Aperture-priority auto Aperture
The metering method itself can not be changed while exposure lock is in effect.
Shutter-release
button
AE-L/AF-L button