Nikon D300 User Manual (en)

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U
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.
a6: AF Point Illumination
Choose whether the active focus point is highlighted in red in the 
viewfinder.
Option
Description
Shutter/
AF-ON 
(default)
Autofocus can be performed with the 
B button or by 
pressing the shutter-release button halfway.
B only
Autofocus can only be performed using the 
B button.
Option
Description
Auto
(default)
The selected focus point is automatically highlighted as 
needed to establish contrast with the background.
On
The selected focus point is always highlighted, regardless of 
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.