Nikon D300 - Manual (Page 288)

262
U
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.