Nikon D7500 User Manual page 330

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 (0 255).
• 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 (0 255, 259).
• 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
(0 148) or extreme values selected for Picture Control parameters
(0 151).
• In % mode, randomly-spaced bright pixels, fog, or lines may be more
noticeable in pictures shot under low light.
Flicker or banding appears in movie mode: Select Flicker reduction in the
movie shooting menu and choose an option that matches the frequency
of the local AC power supply (0 259).
Bright regions or bands appear in live view: A flashing sign, flash, or other light
source with brief duration was used during live view.
Sound is not recorded with movies: Microphone off is selected for
Microphone sensitivity in the movie shooting menu (0 259).
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