Nikon D300 User Manual (en)

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Long Exp. NR (Long Exposure Noise Reduction)
Choose whether to reduce noise in pictures taken at slow shutter 
speeds.
Option
Description
On
Photographs taken at shutter 
speeds slower than 8 s are 
processed to reduce noise. While 
photographs are being 
processed, the capacity of the 
memory buffer will drop. 
l m” will blink in the shutter 
speed/aperture displays for a 
period of time approximately equal to the current shutter 
speed. In continuous release mode, frame rates will slow 
and while photographs are being processed, the capacity 
of the memory buffer will drop. Photographs can not be 
taken until processing is complete and “
l m” has 
cleared from the displays. Noise reduction will not be 
performed if the camera is turned off before processing is 
complete.
Off (default) Long exposure noise reduction off.