Why the funny names for ISO extremes?

Started Mar 24, 2014 | Discussions thread
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Bunza
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Why the funny names for ISO extremes?
Mar 24, 2014

Instead of just stating the ISO range as 50 - 25,600 why does Nikon state a more-narrow range of 100-6400, and then use names like Lo-1 and Hi-1?

Is there some reason I should try to stay in the more-narrow range?

Here is how Nikon specks the D800:

ISO 100 - 6400

Lo-1 (ISO 50)
Hi-1 (ISO 12,800)
Hi-2 (ISO 25,600)

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Nikon D810 Nikon AF-S Nikkor 14-24mm f/2.8G ED Nikon AF-S Nikkor 24-70mm f/2.8G ED Nikon AF-S Nikkor 70-200mm f/2.8G ED VR II Nikon AF Micro-Nikkor 200mm f/4D ED-IF +2 more
Nikon D800
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