Nikon D750 DSLR Camera (Body Only) - Manual (Page 480)

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4
Press J .
The message shown at right will be
displayed in the monitor and a row of
dashes will appear in the control
panel and viewfinder. To restore
normal operation without inspecting
the low-pass filter, turn the camera off.
5
Raise the mirror.
Press the shutter-release button all
the way down. The mirror will be
raised and the shutter curtain will
open, revealing the low-pass filter.
The display in the viewfinder will
turn off and the row of dashes in the
control panel will flash.
6
Examine the low-pass filter.
Holding the camera so that light falls
on the low-pass filter, examine the
filter for dust or lint. If no foreign
objects are present, proceed to Step 8.