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There is a nice little experiment you can carry out, which will help you
discover the optimum ISO for your Nikon. Download Neatimage[free].
Take identical single subs at 400, 800, 1600, 3200, and 6400, and see
what success Neatimage has removing noise from each of them.
Choose the most successful ISO for your multiple images, and if it does
a pretty good job with higher ISOs such as 32 or 64, remember that there might be occasions when a single sub is all you can get, and still get an
acceptable image.
raymo
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