Nikon D3X - Manual (Page 353)

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e2: Flash Shutter Speed
This option determines the slowest shutter speed available when
using front- or rear-curtain sync or red-eye reduction in
programmed auto or aperture-priority auto exposure modes
(regardless of the setting chosen, shutter speeds can be as slow as
30 s in shutter-priority auto and manual exposure modes or at
flash settings of slow sync, slow rear-curtain sync, or red-eye
reduction with slow sync). Options range from
1 /
60
s ([1/60 s], the
default setting) to 30 s ([30 s]).
e3: Modeling Flash
If [On] (the default setting) is selected when the camera is being
used with an optional flash unit that supports the Nikon Creative
Lighting System (CLS; pg. 186), the flash unit mounted on the
camera and any CLS-compatible remote flash units will emit a
modeling flash when the camera depth-of-field preview button is
pressed (pg. 113). No modeling flash is emitted if [Off ] is selected.