Reference Manual

393Troubleshooting
Image artifacts appear in the display during shooting: “Noise” (randomly-spaced
bright pixels, fog, or lines) and unexpected colors may appear if you
zoom in on the view through the lens. Randomly-spaced bright pixels,
fog, or bright spots may also arise as a result of increases in the
temperature of the camera’s internal circuits during shooting; turn the
camera off when it is not in use. At high ISO sensitivities, noise may
become more noticeable in long exposures or in pictures recorded when
the camera temperature is elevated. Note that the distribution of noise
in the display may differ from that in the final picture. To reduce noise,
adjust settings such as ISO sensitivity, shutter speed, or Active
D-Lighting.
The camera cannot measure white balance: The subject is too dark or too bright.
Images cannot be selected as source for preset white balance: The images in
question were created with a different model of camera.
White balance bracketing is unavailable:
• An NEF (RAW) or NEF+JPEG image quality option is selected for image
quality.
• Multiple exposure or HDR (high dynamic range) photography is on.
The effects of Picture Controls differ from image to image: Auto is selected for Set
Picture Control, a Picture Control based on Auto is selected, or A (auto)
is selected for Quick sharp, contrast, or saturation. For consistent results
over a series of photographs, choose another setting.
Metering cannot be changed: Autoexposure lock is in effect.
Exposure compensation cannot be used: Choose mode P, S, or A.
Noise (colored splotches or other artifacts) appears in long time-exposures: Enable
long exposure noise reduction.
The AF-assist illuminator does not light:
• Select On for Custom Setting a12 (Built-in AF-assist illuminator).
• The illuminator does not light in movie mode or when AF-C or MF is
selected for focus mode.