274Ua10: AF-On for MB-D10Choose the function assigned tothe B button on the optionalMB-D10 battery pack.Option DescriptionA AF-ON(default)Pressing the MB-D10 B button initiatesautofocus.B AE/AF lock Focus and exposure lock while the MB-D10 Bbutton is pressed.C AE lock only Exposure locks while the MB-D10 B button ispressed.D AE lock (Reseton release)Exposure locks when the MB-D10 B button ispressed, and remains locked until the button ispressed a second time, the shutter is released orthe exposure meters turn off.E AE lock (Hold)Exposure locks when the MB-D10 B button ispressed, and remains locked until the button ispressed a second time or the exposure meters turnoff.F AF lock only Focus locks while the MB-D10 B button ispressed.G Same asFUNC. buttonThe MB-D10 B button performs the functionselected for Custom Setting f4 (pg. 302).