Nikon D3300 Manuale Di Riferimento

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116 P, S, A, and M Modes
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.
Press the shutter-release 
button halfway.
2
Lock exposure.
With the shutter-release button 
pressed halfway (q) and the subject 
positioned in the focus point, press 
the 
A (L) button (w) to lock 
exposure.
While exposure lock is in effect, an AE-L 
indicator will appear in the viewfinder.
Shutter-release button
A (L) button