The Low-Pass Filter
The CCD 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 ob-
jects 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.
Remove the lens and turn the camera on.
up from the set up menu (
Yes and press the multi se lec tor to the right.
The mes sage, "Press shutter-release but ton"
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.
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.
Holding the camera so that light falls on the
low-pass ﬁ lter, ex am ine the ﬁ lter for dust or
lint. If there are for eign ob jects on the ﬁ lter,
the ﬁ lter requires cleaning. See the fol low ing
but ton and select Mirror lock-