Nikon D5100 Mode D'Emploi

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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, “
l m” 
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 HighNormal, 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.