Nikon D5100 Autoexposure Lock, AE-L, metering, AE-L/AF-L, AE-L/AF-L, Spot metering, Center-weighted, 1Meter exposure, 2 Lock exposure, 3Recompose the photograph

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 ior jmode.

1Meter 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.	Shutter-release
With the shutter-release button pressed halfway and the	button
subject positioned in the focus point, press the AE-L/AF-L	t
button to lock exposure.
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-Lbutton, see Custom Setting f2
(Assign AE-L/AF-L button; 0 166).	AE-L/AF-L button

While exposure lock is in effect, an AE-Lindicator will appear in the viewfinder.

3Recompose the photograph.

Keeping the AE-L/AF-Lbutton pressed, recompose the photograph and shoot.

AAdjusting 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; 062)
Shutter-priority auto	Shutter speed
Aperture-priority auto	Aperture

The metering method itself can not be changed while exposure lock is in effect.

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