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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 top 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 top 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.