Nikon D5 - Manual (Page 112)

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The image sensor that acts as the camera’s picture element is fitted
with a low-pass filter to prevent moiré. Dirt or dust entering the
camera when lenses are exchanged or the body cap is removed
may adhere to the filter and affect your photographs. The Clean
image sensor option vibrates the filter to remove dust.
Use this option to lock the mirror up so that dust that can not be
removed using Clean image sensor can be removed manually as
described in the section on manual cleaning in the User’s Manual.
Note, however, that because the low-pass filter is easily damaged,
we recommend that manual cleaning be performed only by a
Nikon-authorized service representative.
Clean Image Sensor
G button
➜ B setup menu
Option Description
Clean now Perform image sensor cleaning immediately.
Clean at startup/
shutdown
• 5 Clean at startup: The image sensor is automatically
cleaned each time the camera is turned on.
• 6 Clean at shutdown: The image sensor is automatically
cleaned during shutdown each time the camera is
turned off.
• 7 Clean at startup & shutdown: The image sensor is
cleaned automatically at startup and at shutdown.
• Cleaning off: Automatic image sensor cleaning off.
Lock Mirror up for Cleaning
G button
➜ B setup menu