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 will blink on the Control panel and in the
Viewfinder. During this second exposure, while Job nr is
flashing, you cannot use the camera. If you turn it off
while Job nr is flashing, the camera still keeps the first
image; it just doesn’t do any noise reduction on it.
If Long exp. NR is set to On, the frame advance rate may
slow down a little in Continuous release mode and the
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 Long exp. NR set to On. I left the shutter open
for 30 seconds at a time hoping to catch a lightning strike in a
storm near my home. The camera used the Long exp. NR’s
black frame subtraction method to remove noise from my
lighting strike image, without seriously blurring the image in
the process.
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