Custom Setting #F4 Func Button Setting; Command Dials - Nikon D300 Complete Manual

Recommendation:
1. You need to set this to match your other Nikon DSLR
camera bodies. The default mimics the consumer bodies,
the alternative mimics the pro bodies. Why consumers
and pros go different directions in Nikon's wisdom is not
something I know the answer to.

Custom Setting #F4 FUNC Button Setting

(Assign FUNC. button)
The Fn button on the front of the camera can be
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programmed to do one of many useful things. Moreover, you
have the choice of making the assignments using only a
button press, or by using the button in conjunction with the

Command dials

Button Press only:
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[sic] Nikon's manuals refer to it as the FUNC. button. Apparently, there wasn't
enough room to stencil FUNC on the camera body.
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Some settings allow you to choose an option for both press and press+dials. For
example, you can set the button to spot metering and still have it work with dials for
bracketing. But not all combinations are possible. Most settings force you to use the
button either via a single press or via pressing in conjunction with the Command
dials.
Thom Hogan's Complete Guide to the Nikon D300
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