Nikon D40 Low-Pass Filter, Low-pass filter, Present, proceed to Step, Use a Reliable Power Source

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. If you suspect that dirt or dust on the filter is appearing in photographs, you can clean the filter as described below. Note, however, that the filter is extremely delicate and easily damaged. Nikon recommends that the filter be cleaned only by Nikon-authorized service personnel. To prevent the camera from powering off while the mirror is raised, use a fully-charged battery or an optional EH-5 or EH-5a AC adapter with an EP-5 power connector ( 103).

1Remove the lens and turn the camera on.

2Select Mirror lock-upfrom the setup menu (note that this option is not available at

battery levels of or below).

3Highlight On and press OK. The message shown at right will be displayed. To restore normal operation without inspecting the low-pass filter, turn the camera off.

4Press the shutter-release button all the way down. The mirror will be raised and the shutter curtain will open, revealing the

low-pass filter.

5Holding 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 7.

6	Remove any dust and lint from the filter with a blower. Do not
	use a blower-brush, as the bristles could damage the filter.

Dirt that can not be removed with a blower can only be removed by Nikon-authorized service personnel. Under no circumstances should you touch or wipe the filter.

7Turn the camera off. The mirror will be lowered and the shutter curtain will close. Replace the lens or body cap.

Use a Reliable Power Source

The shutter curtain is delicate and easily damaged. If the camera turns off with the mirror raised, the curtain will close automatically. To prevent damage to the curtain, observe the following precautions:

•Do not turn the camera off until cleaning or inspection is complete. Do not remove or disconnect the power source while the mirror is raised.

•If the battery runs low while the mirror is raised, a beep will sound and the AF-assist illuminator will blink to warn that the shutter curtain will close and the mirror will be lowered after about two min- utes. End cleaning or inspection immediately.

Technical Notes/Caring for the Camera 105