Multi Selector; Custom Setting F3 (D300S) And F2 (D) - Nikon D300 User Manual

Obviously, if your current memory card only has one folder,
this setting will have little effect, except to display the one
folder.
My Recommendation: I have my camera set so that when I
press the Multi selector center button in Shooting mode, it
jumps to the center AF point. It saves time because
I don't have to scroll back manually. The setting that does this
is Shooting mode > Select center focus point.
When I press the Multi selector center button in Playback
mode, I have the camera show me a luminance histogram
with the setting Playback mode > View histograms. I
absolutely adore being able to see a histogram for an image I
just took by pressing the Multi selector center button instead
of scrolling to the histogram screen. It is very fast and lets me
see my camera's histogram when I need it most.
Play with the other settings concerning thumbnails and
zooming. You may want to use one of those instead of my
favorites.

Multi Selector

Custom setting f3 (D300S) and f2 (D300)
(User's Manual – D300S page 292; D300 page 302)
The Multi selector function allows you to set the camera's
Multi Selector so that any usage of it turns the light meter on
or resets its delay back to the value found in Custom setting
c2 (Auto meter-off delay). This allows the light meter to stay
on after you've used the Multi Selector until the Auto
meter-off delay timeout expires.
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