Nikon D5 - Manual (Page 46)

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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 or
fog). The time required for processing
roughly doubles; during processing,
“l m” will flash in the shutter speed/
aperture displays 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). In continuous release mode, frame rates will slow and
while photographs are being processed, the capacity of the
memory buffer will drop.
Photographs taken at high ISO sensitivities can be processed to
reduce “noise”.
Long Exposure NR
(Long Exposure Noise Reduction)
G button
➜ C photo shooting menu
High ISO NR
G button
➜ C photo shooting menu
Option Description
High Reduce noise (randomly-spaced bright pixels), particularly in
pictures taken at high ISO sensitivities. Choose the amount of
noise reduction performed from High, Normal, and Low.
Normal
Low
Off
Noise reduction is performed only as required and never at an
amount as high as when Low is selected.