308Ua4: Focus Tracking with Lock-OnThis option controls how autofocus adjusts to sudden largechanges in the distance to the subject.a5: AF ActivationThis option controls whether both the shutter-release button andthe B button can be used to initiate autofocus, or whetherautofocus is only initiated when the B button is pressed.Option DescriptionC Long When the distance to the subject changes abruptly, thecamera waits for the specified period (long, normal, orshort) before adjusting the distance to the subject. Thisprevents the camera from refocusing when the subject isbriefly obscured by objects passing through the frame.D Normal(default)E ShortOffThe camera immediately adjusts focus when the distanceto the subject changes. Use when photographing a seriesof subjects at varying distances in quick succession.Option DescriptionShutter/AF-ON(default)Autofocus can be performed with the B button or bypressing the shutter-release button halfway.B only Autofocus can only be performed using the B button.
