Nikon D300 User Manual (en)

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Continuous-servo AF
Press the AE-L/AF-L button to lock both 
focus and exposure (an AE-L icon appears 
in the viewfinder, see page 112). Focus 
and exposure will remain locked while 
the AE-L/AF-L button is pressed, even if 
you later remove your finger from the 
shutter-release button.
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Recompose the 
photograph and shoot.
Focus will remain locked 
between shots as long as the 
shutter-release button is kept 
pressed halfway, allowing several photographs in succession 
to be taken at the same focus setting. Focus will also remain 
locked between shots while the AE-L/AF-L button is pressed.
Do not change the distance between the camera and the 
subject while focus lock is in effect. If the subject moves, focus 
again at the new distance.
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See Also
For information on choosing the role played by the AE-L/AF-L button, see 
Custom Setting f6 ([Assign AE-L/AF-L button], pg. 306).
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Shutter-release 
button
AE-L/AF-L
 button