Nikon Nikon Df Product Manual - Page 267

a3: Focus Tracking with LockOn G button ➜ A Custom Settings menu This option controls how autofocus adjusts to sudden large changes in the distance to the subject when AF-C is selected during viewfinder photography (0 59). Option Description C 5 (Long) (4 When the distance to the subject changes abruptly, the camera waits for the specified period before adjusting the D 3 (Normal) distance to the subject. This prevents the camera from )2 refocusing when the subject is briefly obscured by objects passing through the frame. E 1 (Short) The camera immediately adjusts focus when the distance Off to the subject changes. Use when photographing a series of subjects at varying distances in quick succession. a4: AF Activation G button ➜ A Custom Settings menu If Shutter/AF-ON is selected, both the shutter-release button and the B button can be used to initiate autofocus. Select AF-ON only to prevent the camera focusing when the shutter-release button is pressed halfway. U 247