There are several ways of thinking about "native ISO". If you qualify the question to mean, "At what ISO is the noise level lowest and dynamic range highest?", the answer for the Nikon D700 would probably be around ISO 170 (RAW sensitivity measured using DXO), but you would set the camera at ISO 200. (Tonal range and color sensitivity also peak at the ISO 200 setting.)
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it's
200-6400
100 - 25600 extended
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