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ISO. In my opinion, from the results I achieved, the ISO performance is about equal to a D3. It is in no way a D4, and wasn’t intended to be. It’s not a D3S either. You should expect it to perform close to the D700 and D3 with respect to ISO
Ok, ISO performance. I was really surprised that it performed just about as well as a D3 with regard to ISO. This seems to be one of the biggest concerns. It's not a concern to me. Now, I won't be using the D800 in the most extreme low light conditions. That's...Show more →
Those are two comments from Cliff Mautner, who is reviewing the D800, and blogging about it, for Nikon. He spends more time extolling features, especially improved autofocus.
Given the remark about "extreme low light conditions" I am more inclined than previously to assume that the D800 will not prove to be a great camera for natural light—hence not a great landscape camera.