Help me decide UWA lens for D700

17-35mm is the best choice. With the UW magnification factor it will provide the most usable range of focal length and FOV and it will work with most domes. Be sure for any lens you buy that it will work with your existing port or the cost for new port and whether or not the lens will require the use of a closeup lens.

Good place to get this information is from Backscatter in Monterey.