Question about Nikon D90 Digital Camera with 18-105mm lens
By default, this button locks the autofocus and exposure. It can be reconfigured to lock only one or the other, or other things. See the "f4: Assign AE-L/AF-L Button" section of the manual (page 200 in my copy). A fuller description of the focus lock is given in the "Focus Lock" section of the manual (page 57 in my copy).
If you need a manual you may download a copy from here.
Posted on Jan 04, 2013
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Posted on Jan 02, 2017
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