Sigma 17mm - 35mm f/2.8-4.0 EX DG Aspherical HSM Autofocus Super Wide Angle Zoom Lens for Sigma SLR Cameras.

• 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