Nikon D2HS - Manual (Page 258)

244
Technical Notes—Caring for the Camera
The Low-Pass Filter
The image sensor that acts as the cam era’s picture element is fi tted with a
low-pass fi lter to prevent moiré. Al though this fi lter prevents foreign objects
from adhering directly to the image sensor, under certain con di tions dirt or
dust on the fi lter may appear in photographs. If you suspect that dirt or dust
in side the camera is affecting your pho to graphs, you can check for the pres-
ence of for eign ob jects on the low-pass fi lter as described below.
1 Turn the camera off and connect an EH-6 AC adapter (available sep a -
rate ly). If you do not have access to an EH-6 AC adapter, take the cam-
era to a Nikon-au tho rized service center.
2 Remove the lens and turn the camera on.
3 Press the but ton and select Mirror lock-up
from the set up menu ( 198). The message
shown at right will be displayed.
4 Press the multi se lec tor to the right. The mes-
sage shown at right will be displayed in the
cam era mon i tor, and a row of dash es will be
dis played in the con trol pan el and viewfi nder.
To return to normal operation without raising
the mirror, turn the camera off. Mirror lock-
up will also be cancelled if the monitor is al-
lowed to turn off automatically.
5 Press the shut ter-re lease but ton all the way
down. The mir ror will be raised and the shut-
ter cur tain will open, re veal ing the low-pass
fi l ter, and the row of dashes in the con trol
panel will blink. The displays in the viewfi nder
and rear control panel will turn off.