Nikon D300 User Manual page 283

▪ Same as Fn (FUNC.) button – The MB-D10's
button performs whatever function has been selected in
the Custom Setting
setting f5
My Recommendation: When I'm using the MB-D10 on my
camera, I want the extra
the AF-ON button
the menu. If you use auto exposure
(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
image.
called
in D300S and f4
AF-ON button
on the camera body, so I set it to
AF-ON button
283
Assign Fn button (Custom
in D300).
to perform just like
(AE-L)
when shooting a vertical
AF-ON
AF-ON in
or autofocus