Long Exposure Noise
The following are 100% zooms of the central image area of shots from a
Nikon D700 with lens cap on; ISO100, no noise reduction. Exposure
times are: 1/2 a second, 30 seconds, 60 seconds, 120 seconds, 300 seconds
and 600 seconds. Unsurprisingly, random noise gets progressively worse as
exposure time lengthens; 'hot pixels' are always in the same place, more
appear as exposure time lengthens.
For best reproduction, adjust your monitor so that you can resolve all
26 levels in the gray scale:
1/2 second
30 seconds
60 seconds
120 seconds
300 seconds
600 seconds
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