Long Exposure Nr; High Iso Nr - Nikon D5100 Reference Manual

Long Exposure NR

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).

High ISO NR

Photographs taken at high ISO sensitivities can be processed to reduce "noise. "
Option
High
Reduce noise (randomly-spaced bright pixels, lines, or fog), particularly in
Normal photographs taken at high ISO sensitivities. Choose the amount of noise reduction
performed from High, Normal, and Low.
Low
Noise reduction is only performed at ISO sensitivities of ISO 1600 and higher. The
Off amount of noise reduction is less than the amount performed when Low is selected
for High ISO NR.
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G button
G button
Description
C shooting menu
C shooting menu