BlattWorld, Item Details: Sigma 500mm F4.5 APO EX HSM Lens

Sigma's APO 500mm F4.5 EX is one of three new ultra telephoto lenses. It is an Apochromatic ultra-telephoto lens with a fast F4.5 maximum aperture, and it incorporates two Extraordinary Low Dispersion glass elements (Abbe number 90.3), to reduce chromatic

aberration to a minimum. It incorporates internal focusing which enables responsive and fast auto focus speed. It also features a rotatable drop-in filter holder in the rear part of the lens barrel, which facilitates the use of filters, including a polar

izIng filter. Sigma's dedicated APO Tele Converter 1.4x AF and 2x MF converters can be used with this lens. The lens materials used in this new lens are lead and arsenic free ecological glass