Sigma Telephoto 500mm f/4.5 EX APO DG HSM Autofocus Lens for Sigma AF

Two ELD glass elements in the front lens elements reduce chromatic aberration to a minimum and also ensure sharp, quality images of high contrast.\n\nNew coating reduces Ghost and Flare.\nThe new multi layer lens coating and lens design reduce flare and ghost, which is a common problem with digital cameras and also creates an optimum color balance.\n\nIt also features a rotatable drop-in filter.\nIt also features a drop-in 46mm filter holder in the rear part of the lens barrel, which can be rotated to facilitate the use of filters, including a polarizing filter.\n\nHSM.\nThe AF drive features Sigma’s ultra-quiet and high-speed Hyper Sonic Motor (HSM).\n\nInner Focus.\nInner focusing retains external dimensions for ease of handling.\n\nAccepts both 1.4X and 2X APO EX Tele-Converters.\nBy adding an APO teleconverter (optional extra), you can use this lens as a 700mm F6.3 MF ultra-telephoto lens with a 1.4X EX teleconverter, or as a 1000mm F9 MF ultra-telephoto lens with a 2X teleconverter.