320UChoose the function assigned to theB button on the optionalMB-D12 battery pack.f13: Assign MB-D12 AF-ON G button ➜ A Custom Settings menuOption DescriptionA AF-ON Pressing the MB-D12 B button initiates autofocus.r FV lockPress the MB-D12 B button to lock flash value(built-in flash and compatible optional flash units only,0 190, 382). Press again to cancel FV lock.B AE/AF lock Focus and exposure lock while the MB-D12 Bbutton is pressed.C AE lock only Exposure locks while the MB-D12 B button ispressed.D AE lock (Reseton release)Exposure locks when the MB-D12 B button ispressed, and remains locked until the button ispressed a second time, the shutter is released or theexposure meters turn off.E AE lock (Hold)Exposure locks when the MB-D12 B button ispressed, and remains locked until the button ispressed a second time or the exposure meters turn off.F AF lock only Focus locks while the MB-D12 B button is pressed.G Same as FnbuttonThe MB-D12 B button performs the functionselected for Custom Setting f4 (0 311).
