Nikon D5200 - Manual (Page 170)

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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). The time required for
processing roughly doubles; during processing, “
l m” will flash 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.”
Adjust ISO sensitivity ( 0 49).
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.
ISO Sensitivity Settings G button
➜ C shooting menu