Nikon D50 D50 User's Manual - Page 126

The Low-Pass Filter, Mirror Lock-Up

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Technical Notes-Caring for the Camera The Low-Pass Filter The image sensor that acts as the camera's picture element is fitted with a low-pass filter to prevent moiré. Although this filter prevents foreign objects from adhering directly to the image sensor, under certain conditions dirt or dust on the filter may appear in photographs. If you suspect that dirt or dust inside the camera is affecting your photographs, you can check for the presence of foreign objects on the low-pass filter as described below. 1 Remove the lens and turn the camera on. 2 Choose Yes for the Mirror Lock-Up option in the setup menu ( 68). The message, "Press shutter-release button" will be displayed. 3 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, and a row of dashes will blink in the control panel. 4 Holding the camera so that light falls on the low-pass filter, examine the filter for dust or lint. If there are foreign objects on the filter, the filter requires cleaning. See the following section. 5 Turn the camera off. The mirror will return to the down position and the shutter curtain will close. Replace the lens or body cap and disconnect the AC adapter. Use a Reliable Power Source To prevent the camera from powering off while the mirror is raised, use a fullycharged battery or an EH-5 AC adapter (available separately) for prolonged inspec- 116 tion or cleaning of the low-pass filter.

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116
Technical Notes—Caring for the Camera
The Low-Pass Filter
The image sensor that acts as the camera’s picture element is fitted with a
low-pass filter to prevent moiré.
Although this filter prevents foreign ob-
jects from adhering directly to the image sensor, under certain conditions
dirt or dust on the filter may appear in photographs.
If you suspect that dirt
or dust inside the camera is affecting your photographs, you can check for
the presence of foreign objects on the low-pass filter as described below.
1
Remove the lens and turn the camera on.
2
Choose
Yes
for the
Mirror Lock-Up
option
in the setup menu (
68).
The message,
“Press shutter-release button” will be dis-
played.
3
Press the shutter-release button all the way
down.
The mirror will be raised and the shut-
ter curtain will open, revealing the low-pass
filter, and a row of dashes will blink in the
control panel.
4
Holding the camera so that light falls on the
low-pass filter, examine the filter for dust or
lint.
If there are foreign objects on the filter,
the filter requires cleaning.
See the following
section.
5
Turn the camera off.
The mirror will return to the down position and
the shutter curtain will close.
Replace the lens or body cap and dis-
connect the AC adapter.
Use a Reliable Power Source
To prevent the camera from powering off while the mirror is raised, use a fully-
charged battery or an EH-5 AC adapter (available separately) for prolonged inspec-
tion or cleaning of the low-pass filter.