Nikon D90 DX D90 User's Manual - Page 196
a6: AE-L/AF-L for MB-D80, a7: Live View Autofocus
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a6: AE-L/AF-L for MB-D80 Choose the function assigned to the AE-L/AF-L button on the optional MB-D80 battery pack. This option is available in all shooting modes. Option Description B AE/AF lock * (default) Focus and exposure lock while the MB-D80 AE-L/AF-L button is pressed. C AE lock only * Exposure locks while the MB-D80 AE-L/AF-L button is pressed. F AF lock only * Focus locks while the MB-D80 AE-L/AF-L button is pressed. E AE lock (Hold) Exposure locks when the MB-D80 AE-L/AF-L button is pressed, and remains locked until the button is pressed a second time or the exposure meters turn off. A AF-ON * Pressing the MB-D80 AE-L/AF-L button initiates autofocus. Flash value for the built-in flash and optional SB-900, SB-800, SB-600, r FV lock SB-400, and SB-R200 flash units locks when the MB-D80 AE-L/AF-L button is pressed (pg. 198), and remains locked until the button is pressed a second time or the exposure meters turn off. x Focus point selection The focus point (pg. 56) can be selected by pressing the MB-D80 AE-L/ AF-L button and rotating the sub-command dial. * Pressing 2 when these options are highlighted displays a Focus point selection sub-menu. If On is selected, the focus point can be chosen by pressing the MB-D80 AE-L/AF-L button and rotating the sub-command dial. a7: Live View Autofocus L This option (available in all shooting modes) determines how the focus point for autofocus is selected in live view. Choose from the following options: Mode Description 8 Face priority The camera automatically detects and focuses on portrait subjects facing camera. Use for portraits; default for k and o modes. 9 Wide area (default) Use for hand-held shots of landscapes and other non-portrait subjects. The focus point can be selected manually. Default for i, j, l, m, P, S, A, and M modes. ! Normal area Use for pin-point focus on a selected spot in the frame. A tripod is recommended. Default setting for n mode. 176