Clean image sensor, Lock mirror up for cleaning, Video mode – Nikon D300 User Manual
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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).
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