I'm looking at a pole system for a possible upcoming project. I have a very basic question - how workable is pole shooting with a camera/lens combo (D800e/Nikkor 16mm in my case) that requires Nadir and Zenith shots? Having never tried a pole setup, it would seem to be exceptionally difficult - especially the nadir(s). Wondering if I'd be better off purchasing a true fisheye and sacrificing some resolution.