For Canon

Sigma 800mm F5.6 EX DG APO HSM Auto Focus Super Telephoto Lens       

Sigma's APO 800mm f5.6 EX is one of the EX Series lenses. It is an Apochromatic ultra-telephoto lens with a fast F5.6 maximum aperture, and incorporates two Extraordinary Low Dispersion glass elements, to reduce chromatic aberration to minimum limit. It also incorporates internal focusing which enables responsive and fast auto focus speed. The AF drive for Sigma SA, Canon and Nikon SLR. cameras features the ultra-quiet Hyper Sonic Motor (H.S.M.). This new lens also incorporates a rotary filter holder in the rear part of the lens barrel, which enables the use of a polarizing filter. Sigma's dedicated APO EX Tele Converter 1.4x MF and 2x MF can be used with this lens. The lens materials used in this new lens are lead and arsenic free ecological glass.

Specifications
Construction 10 Groups /13 Elements
Angle of view 3.1°
F stop range 32
Closest Focusing Distance 700cm /275.6"
Maximum Magnification 1:8.8
Filter Size 46mm (Rear)
Dimensions (Length x Diameter) 156.5 x 520mm / 6.2 x 20.5"
Weight 4,740g / 167.2oz