Nikon D750 Product Manual - Page 476
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" Holding the camera base down, select Clean image sensor in the setup menu, then highlight Clean now and press J. The camera will check the image sensor and then begin cleaning. Other operations can not be performed while cleaning is in progress. Do not remove or disconnect the power source until cleaning ends and the setup menu is displayed. 448
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