Nikon D5 User Manual page 380

Noise (bright spots, randomly-spaced bright pixels, fog, or lines) appear in photos:
• Bright spots, randomly-spaced bright pixels, fog, and lines can be
reduced by lowering ISO sensitivity.
• Use the Long exposure NR option in the photo shooting menu to limit
the occurrence of bright spots or fog in photos taken at shutter speeds
slower than 1 s (0 292).
• Fog and bright spots may indicate that the camera's internal temperature
has become elevated due to high ambient temperatures, long
exposures, or similar causes: turn the camera off and wait for it to cool
before resuming shooting.
• At high ISO sensitivities, lines may appear in photos taken with some
optional flash units; if this occurs, choose a lower value.
• At high ISO sensitivities, including high values selected with auto ISO
sensitivity control, randomly-spaced bright pixels can be reduced by
selecting High, Normal, or Low for High ISO NR in the photo or movie
shooting menu (0 292, 296).
• At high ISO sensitivities, bright spots, randomly-spaced bright pixels, fog,
or lines may be more noticeable in long exposures, multiple exposures,
and photos taken at high ambient temperatures or with Active
D-Lighting enabled, Flat selected for Set Picture Control (0 179) or
extreme values selected for Picture Control parameters (0 182).
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 (0 296).
Bright regions or bands appear in live view: A flashing sign, flash, or other light
source with brief duration was used during live view.
Smudges appear in photographs: Clean front and rear lens elements. If problem
persists, perform image sensor cleaning (0 343).
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