312Ua9: AF-ON ButtonChoose the function performed when theB button is pressed.Option DescriptionA B(default) Pressing the B button initiates autofocus.B AE/AF lock Focus and exposure lock while the B button ispressed.C AE lock only Exposure locks while the B button is pressed.DAE lock(Reset onrelease)Exposure locks when the B button is pressed, andremains locked until the button is pressed a secondtime, the shutter is released, or the exposure metersturn off.E AE lock(Hold)Exposure locks when the B button is pressed, andremains locked until the button is pressed a secondtime or the exposure meters turn off.F AF lock only Focus locks while the B button is pressed.
