Nikon D5100 - Long Exposure NR; High ISO NR

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If On is selected, photographs taken at shutter speeds slower
than 1 s will be processed to reduce noise (bright spots,
randomly-spaced bright pixels, or fog), increasing the time
required to record images by roughly 1.5 to 2 times.
During processing, “lm”
will blink in the viewfinder and pictures can not be taken (if the camera is turned off
before processing is complete, the picture will be saved but noise reduction will not
be performed).
Photographs taken at high ISO sensitivities can be processed to reduce “noise.”
Long Exposure NR
G button ➜ C shooting menu
High ISO NR
G button ➜ C shooting menu
Option Description
High
Reduce noise (randomly-spaced bright pixels, lines, or fog), particularly in
photographs taken at high ISO sensitivities.
Choose the amount of noise reduction
performed from High, Normal, and Low.
Normal
Low
Off
Noise reduction is only performed at ISO sensitivities of ISO 1600 and higher.
The
amount of noise reduction is less than the amount performed when Low is selected
for High ISO NR.