Nikon D90 - Page 78

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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.
• Continuous Mode (pg. 65)
Use the AE-VAF-L button to lock focus in continuous mode .
• See Also
Custom Setting f4 (Assign AE-L/AF-L Button; pg. 200) controls the behavior of the AE-lIAF-L
button.