Nikon D300 User Manual page 200

image to get rid of noise. I've taken exposures of around
30 seconds and had perfectly usable results. The only
drawback is that the exposure time is
doubled since two images are taken. The black frame
image is not written to the memory card, so you'll only
have one image, with much less noise, in the end.
While the black frame image is being processed, the
words Job nr
Viewfinder. During this second exposure, while
flashing, you cannot use the camera. If you turn it off
while Job nr
image; it just doesn't do any noise reduction on it.
If Long exp. NR is
slow down a little in
capacity of the in-camera memory buffer will drop,
usually by one image.
▪ Off: If you select Off, then you will have no long
exposure noise reduction with exposures above 8
seconds.
Figure 3-42 is a sample image I took with a 30-second
exposure and
for 30 seconds at a time hoping to catch a lightning strike in a
storm near my home. The camera used the
black frame subtraction method to remove noise from my
lighting strike image, without seriously blurring the image in
the process.
will blink on the
is flashing, the camera still keeps the first
set to On, the frame advance rate may
Continuous release mode
Long exp. NR
Control panel
set to On. I left the shutter open
200
and in the
Job nr
and the
Long exp. NR's
is