Nikon D90 - Manual (Page 188)

168
i
High ISO NR
Photographs taken at high ISO sensitivities can be processed to reduce “noise.” This
option is available in all modes.
Option Description
S High Noise reduction is performed at ISO sensitivities of ISO 800 and higher. While
photographs are being processed, the capacity of the memory buffer will
drop. Choose the amount of noise reduction performed from High, Normal,
and Low.
T
Normal
(default)
U Low
Off
Noise reduction is only performed at sensitivities of Hi 0.3 and higher. The
amount of noise reduction is less than the amount performed when Low is
selected for High ISO NR.