This is a beautiful fisheye Nikkor lens. It uses the older AF system so it requires a camera with a built-in motor for AF (ask if you are not sure). That said, manually focusing is pretty easy with a 16mm lens.
The lens is in clean condition with clean scratch-free glass and perfect operation. It comes with the rear clear filter, which is needed for perfect focus. It comes with original caps. The front cap is a little loose and has been shimmed with tape for a good fit.