Sigma 17-35mm F2.8-4 EX DG Aspherical HSM AutoFocus Super Wide Angle Telephoto Lens          

The lens covers a super-wide angle of view 104°and has a large-aperture. It has a minimum focusing distance of 27mm at all focal lengths, and maximum magnification ratio of 1:4.5. The models which are equipped with HSM (Hyper Sonic Motor) system are ensured a quiet, high-speed AF as well as offering Full Time Manual Focusing. Special Low Dispersion (SLD) and two aspherical glass elements provide excellent compensation for distortion as well as for various aberrations. The design concept of this lens is especially suitable for the characteristics of Digital SLR Cameras. The high performance inner focus system is particularly suitable for using circular polarizing filters and a petal-type hood as the front of the lens does not rotate
Features
Covers a super-wide angle of view 104 degrees. Its large aperture makes this lens an excellent companion for both Digital SLRs and Film Cameras
Minimum focusing distance of 27cm at all focal lengths
Maximum Magnification of 1:4.5
HSM (Hyper Sonic Motor) system (only for Sigma, Nikon and Canon mounts). Featuring full time manual focus
EX DG Series, the ideal lens for Digital SLR Cameras

Specifications
Construction 16 Elements in 13Groups
Angle of view 103.7°-63.4°
F stop range Minimum Aperture :F22
Closest Focusing Distance 27cm (10.6")
Maximum Magnification 1:4.5
Filter Size 77mm
Dimensions (Length x Diameter) Diameter 83.5mm (3.3")X Length 86.2mm (3.4")
Weight 560gr/19.8ounces

 

For Canon
For Nikon
For Pentax