The Sigma APO 300mm f2.8 EX is one of Sigma's exclusive EX Series of lenses.
It is an ultra compact Apochromatic telephoto lens with a fast F2.8 maximum aperture, and 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.
The AF drive for Canon and Nikon SLR cameras feature Sigma's ultra-quiet Hyper Sonic Motor (H.S.M.) for unbelievably fast and quiet focusing.Sigma's dedicated APO EX Tele Converter 1.4x and 2x lenses work easily with this lens without sacrificing the AF speed of the Sigma APO 300mm F2.8 EX.
A detachable tripod socket and rotatable drop in filter holder are provided.
The lens materials used in this new lens are lead and arsenic free ecological glass.
This lens can be used with Sigma 2x EX Apo Tele-Converter as 600mm f5.6 Ultra Telephoto lens with maximum close-up magnification of 1:3.75, for auto focus with many cameras, or with The Sigma 1.4x EX APO Tele-Converter as 420mm f4 Telephoto lens, for auto focus with many cameras."A solid, beautifully made, well-designed lens of professional caliber.
"Popular Photography, December 1999
