Nikon D300 User Manual (en)

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Clean Image Sensor
Select this option to remove dust from the image sensor or to 
choose options for automatic image sensor cleaning (pg. 373).
Lock Mirror up for Cleaning
Lock the mirror in the up position to allow inspection or manual 
cleaning of the low-pass filter that protects the camera image 
sensor (pg. 376).
Video Mode
When connecting the camera to a television or VCR via the video 
connector, be sure the camera video mode matches the device 
video standard (NTSC or PAL).