This is a rare and highly regarded fast tele lens for Nikon that is often sold as a collectible. This one works well but shows a good bit of wear and has a lot of dust inside with a couple of large particles (not fungus). None of this effects the image quality. The lens gives beautiful results and has very smooth operation. It comes with a Nikon AI mount. It comes with caps and the shade in the box. Get a deal on a nice lens.