Nikon D300 D300 User's Manual - Page 297

a5: AF Activation This option controls whether both the shutter-release button and the B button can be used to initiate autofocus, or whether autofocus is only initiated when the B button is pressed. Option Shutter/ AF-ON (default) B only Description Autofocus can be performed with the B button or by pressing the shutter-release button halfway. Autofocus can only be performed using the B button. a6: AF Point Illumination Choose whether the active focus point is highlighted in red in the viewfinder. Option Description Auto The selected focus point is automatically highlighted as (default) needed to establish contrast with the background. The selected focus point is always highlighted, regardless of On the brightness of the background. Depending on the brightness of the background, the selected focus point may be difficult to see. Off The selected focus point is not highlighted. U 271