Nikon 25446B D90 User's Manual - Page 220
f4: Assign AE-L/AF-L Button, Option, Description, AE-L/AF-L
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f4: Assign AE-L/AF-L Button Choose the role played by the AE-L/AF-L button. This option is available in all shooting modes. . Option Description B AE/AF lock (default) Focus and exposure lock while the AE-L/AF-L button is pressed. C AE lock only Exposure locks while the AE-L/AF-L button is pressed. F AF lock only Focus locks while the AE-L/AF-L button is pressed. Exposure locks when the AE-L/AF-L button is pressed, and remains locked E AE lock (hold) until the button is pressed a second time or the exposure meters turn off. A AF-ON The AE-L/AF-L button initiates autofocus. The shutter-release button can not be used to focus. Press the AE-L/AF-L button to lock flash value (built-in flash and SB-900, r FV lock SB-800, SB-600, SB-400, and SB-R200 flash units only, pg. 198). Press again to cancel FV lock. L 200