Custom Setting #A10 Mb-D10 Af-On Button Options - Nikon D300 Complete Manual

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Recommendations:

1. Turn it Off, if possible. The light on the camera is

annoying and poorly located (lens hoods and fingers tend

to block it, rendering it ineffective). Instead, mount an

external i-TTL flash and activate its Autofocus Assist

lighting. Both the SB-600 and SB-800 have much wider

patterns of lighting, and because it's a dim red, it's not

2. Note that you must be in Single Servo autofocus and the

center autofocus sensor must be chosen if you're in Single

Point or Dynamic Area autofocus. Otherwise, the

Autofocus Assist light will not function, even if you've set

this function to On.

Custom Setting #A10 MB-D10 AF-ON Button Options

(AF-ON for MB-D10)

Because the optional MB-D10 vertical grip hand position puts

the AE-L/AF-L button too far away to reach easily, Nikon has

wisely chosen to allow you to specify what the handy AF-ON

button on the MB-D10 does.

Thom Hogan's Complete Guide to the Nikon D300

The camera's Autofocus Assist light never

Pressing the MB-D10's AF-ON

button performs the same

function as the camera's AF-ON

button [default]