I know that TIFF files used to be all 8-bit only, just like JPEG, but as I haven't shot TIFF for some time I couldn't tell you for sure. I think TIFF files are either 8 or 16 bit only, and since the D700 doesn't support 16 bit color depth, I'm betting what you're getting is an 8 bit file. If you have access to Photoshop, you should be able to open an image from the camera and get this bit of info from the File Info list.
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