Nikon D750 DSLR Camera (Body Only) - Manual (Page 101)

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Power Aperture
Power aperture is not available with some lenses. Power aperture is
available only in modes
A and M and can not be used while photo
shooting info is displayed (a 6 icon indicates that power aperture can
not be used).
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Using an External Microphone
The optional stereo microphone can be used to record sound in stereo
or to avoid recording focus noise and other sounds made by the lens
(
0 443).
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Headphones
Third-party headphones can be used. Note that high sound levels may
result in high volume; particular care should be taken when
headphones are used.
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See Also
For information on assigning power aperture to the Fn and Pv buttons,
see Custom Settings g1 ( Assign Fn button , 0 370) and g2 ( Assign
preview button , 0 372). The Fn button can be used to widen the
aperture, the Pv button to narrow the aperture.