Nikon D750 Product Manual - Page 494

Smudges appear in photographs: Clean front and rear lens elements. If problem persists, perform image sensor cleaning (0 448). Sound is not recorded with movies: Microphone off is selected for Microphone sensitivity in the movie shooting menu (0 320). Live view ends unexpectedly or does not start: Live view may end automatically to prevent damage to the camera's internal circuits if: • The ambient temperature is high • The camera has been used for extended periods in live view or to record movies • The camera has been used in continuous release modes for extended periods If live view does not start when you press the a button, wait for the internal circuits to cool and then try again. Note that the camera may feel warm to the touch, but this does not indicate a malfunction. Image artifacts appear during live view: The temperature of the camera's internal circuits may rise during live view, causing image "noise" in the form of bright spots, randomly-spaced bright pixels, or fog. Exit live view when the camera is not in use. Flicker or banding appears during live view or movie recording: Choose an option for Flicker reduction that matches the frequency of the local AC power supply (0 380). Bright bands appear during live view or movie recording: A flashing sign, flash, or other light source with brief duration was used during live view or movie recording. Menu item can not be selected: Some options are not available in all modes (0 460). 466