Nikon D700 - Manual (Page 341)

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e4: Modeling Flash
If On (the default setting) is selected when the camera is being
used with the built-in flash or an optional SB-900, SB-800, SB-600,
or SB-R200 flash unit, a modeling flash will be emitted when the
camera depth-of-field preview button is pressed (pg. 115). No
modeling flash is emitted if Off is selected.
e5: Auto Bracketing Set
Choose the setting or settings bracketed when auto bracketing
(pg. 130) is in effect. Choose AE & flash (j; the default setting) to
perform both exposure and flash-level bracketing, AE only (k) to
bracket only exposure, Flash only (l) to perform only flash-level
bracketing, or WB bracketing (m) to perform white-balance
bracketing (pg. 135). Note that white balance bracketing is not
available at image quality settings of NEF (RAW) or
NEF (RAW) + JPEG.