SIGMA LENS 50-500mm f4-6.3 EX APO RF HSM SLR CAMERA LENS Special Low Dispersion glass, plus a seven group zoom system and multi-coated optics, enable this wide-ranging zoom lens to provide a high level of performance, as well as versatility Zoom Lock mechanism helps eliminate zoom creep when the lens is tilted up or down Detachable lens hood is provided to protect the front of the lens from extraneous light Accepts 86mm size filters