Nikon 25442 D3X User's Manual - Page 151
Autoexposure (AE) Lock
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Autoexposure (AE) Lock Use autoexposure lock to recompose photographs after metering exposure. 1 Select center-weighted or Metering selector spot metering (pg. 110). Matrix metering will not produce the desired results with autoexposure lock. If using center-weighted metering, select the center focus point with the multi selector (pg. 78). 2 Lock exposure. Position the subject in the selected Z Shutter-release button focus point and press the shutter- q 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 exposure (and focus, except in manual w focus mode). Confirm that the in-focus indicator (I) appears in the viewfinder. AE-L/AF-L button While exposure lock is in effect, an AE-L indicator will appear in the viewfinder. 125