Nikon D780 Reference Manual page 387

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Silent Live View Photography
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Selecting [On] for [Silent live view photography] does not completely
silence the camera. Camera sounds may still be audible, for example
during autofocus or aperture adjustment, in the latter case most
noticeably at apertures smaller (i.e., at f-numbers higher) than f/5.6.
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During silent live view, you may notice the following in the display.
These phenomena will also be visible in the final pictures.
- Flicker or banding in scenes lit by such sources as fluorescent,
mercury vapor, or sodium lamps
- Distortion associated with motion (individual subjects such as trains
or cars moving at high speed through the frame may be distorted, or
the entire frame may appear distorted when the camera is panned
horizontally)
- Jagged edges, color fringing, moiré, and bright spots in the display
- Bright regions or bands in scenes lit by flashing signs and other
intermittent light sources or when the subject is briefly illuminated by
a strobe or other bright, momentary light source
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Selecting [On] for [Silent live view photography] mutes the shutter,
but this does not absolve photographers of the need to respect their
subjects' privacy and image rights.
Other Shooting Options
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