Nikon D300 - Page 283

▪ Same as Fn (FUNC.) button – The MB-D10’s AF-ON
button performs whatever function has been selected in
the Custom Setting called Assign Fn button (Custom
setting f5 in D300S and f4 in D300).
My Recommendation: When I’m using the MB-D10 on my
camera, I want the extra AF-ON button to perform just like
the AF-ON button on the camera body, so I set it to AF-ON in
the menu. If you use auto exposure (AE-L) or autofocus
(AF-L) lock often, you may feel differently. In that case,
select your favorite function from the menu. Normally, you’ll
only use this extra AF-ON button when shooting a vertical
image.
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