I guess we all aim for the best image quality, don't we? There you have the reason to set the D7000 to ISO 100. At least that's what I usually do: choose the lowest ISO setting possible.
I usually shoot in aperture priority mode (unless I want to freeze action or aim to get motion blur), so I manually choose aperture and ISO and let the camera meter for the correct shutter times. If those turn out to be too long to reliably get blur-free images I'm actually quite happy to have something "silly" and "meaningless" at hand I can adjust in steps I'm used to (in this case ISO stops).
-- Markus
I usually shoot in aperture priority mode (unless I want to freeze action or aim to get motion blur), so I manually choose aperture and ISO and let the camera meter for the correct shutter times. If those turn out to be too long to reliably get blur-free images I'm actually quite happy to have something "silly" and "meaningless" at hand I can adjust in steps I'm used to (in this case ISO stops).
-- Markus
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opticallimits.com