Nikon D300 D300 User's Manual - Page 399
The Low-Pass Filter, “Clean Now”
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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 using the [Clean image sensor] option in the setup menu. The filter can be cleaned at any time using the [Clean now] option, or cleaning can be performed automatically when the camera is turned on or off. ❚❚ "Clean Now" 1 Place the camera base down. Image sensor cleaning is most effective when the camera is placed base down as shown at right. 2 Display the [Clean image sensor] menu. Highlight [Clean image sensor] in the setup menu and press 2. n A Image Sensor Cleaning If the options described in this section are not sufficient to remove dust or other foreign objects from the image sensor, clean the sensor manually as described on page 376. 373