Nikon D6 Reference Manual page 1060

White balance (WB) bracketing is unavailable:
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•
White balance bracketing is not available when an NEF (RAW) or
NEF + JPEG option is selected for image quality.
•
White balance bracketing cannot be used in multiple exposure and
HDR modes.
The effects of [Set Picture Control] differ from image to image:
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[Auto] is selected for [Set Picture Control] or as the basis for a
custom Picture Control created using [Manage Picture Control], or
[A] (auto) is selected for [Quick sharp], [Contrast], or [Saturation].
For consistent results over a series of photographs, choose a setting
other than [A] (auto).
The option selected for metering cannot be changed:
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The option selected for metering cannot be changed during exposure
lock.
Exposure compensation is not available:
●
Changes to exposure compensation in mode M apply only to the
exposure indicator and have no effect on shutter speed or aperture.
Uneven shading may appear in long exposures:
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Uneven shading may appear in long exposures shot at shutter speeds
of A (Bulb) or % (Time). The effect can be mitigated by selecting
[On] for [Long exposure NR] in the photo shooting menu.
Sound is not recorded with movies:
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Is [Microphone off] selected for [Microphone sensitivity] in the
movie shooting menu?
1008 Problems and Solutions