Image artifacts appear in the display during shooting
If this occurs, check the following:
To reduce noise, adjust settings such as ISO sensitivity, shutter speed, or Active D-Lighting.
At high ISO sensitivities, noise may become more noticeable in long exposures or in pictures recorded when the camera temperature is elevated. Select a low ISO sensitivity.
Prolonged use of the camera may cause the internal temperature to rise, resulting in noise in the form of bright spots, randomly-spaced bright pixels, or fog. Turn the camera off when it is not in use.
Randomly-spaced bright pixels, fog, lines or unexpected colors may appear if you press the X button to zoom in on the view through the lens during shooting.
Note that the distribution of noise in the display may differ from that in the final picture.
This issue can sometimes be addressed by checking and optimizing the image sensor. Perform pixel mapping using [Pixel mapping] in the setup menu.