The lens is very clean with no mold or haze. The exterior has some peeling of the printed markings. The tripod collar screw doesn't tighten all the way and won't stop perfectly. It seems to be a lens with good balance and color, but the 500mm prime lens was too heavy for a woman to carry around. It was only used for test shots and has been stored since then. It was used with a D7100. For those who like airplanes and birds. Thank you. Size: Nikon F mount Sigma Focal length: 201-500mm Aperture: 4.1-5.6