Nikon D750 DSLR Camera (Body Only) - Manual (Page 481)

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7
Clean the filter.
Remove any dust and lint from the
filter with a blower. Do not use a
blower-brush, as the bristles could
damage the filter. Dirt that can not be
removed with a blower can only be
removed by Nikon-authorized service
personnel. Under no circumstances should you touch or
wipe the filter.
8
Turn the camera off.
The mirror will return to the down position and the shutter
curtain will close. Replace the lens or body cap.
A
Use a Reliable Power Source
The shutter curtain is delicate and easily damaged. If the camera
powers off while the mirror is raised, the curtain will close
automatically. To prevent damage to the curtain, observe the
following precautions:
• Do not turn the camera off or remove or disconnect the power source
while the mirror is raised.
• If the battery runs low while the mirror is raised, a beep will sound
and the self-timer lamp will flash to warn that the shutter curtain will
close and the mirror will be lowered after about two minutes. End
cleaning or inspection immediately.