Sigma 17-50mm F2.8 EX DC OS HSM Lens
After releasing the 8-16mm f/4.5-5.6 DC HSM lens, the company comes back with the new Sigma 17-50mm F2.8 EX DC OS HSM lens. This compact lens features an Optical Stabilization function, allowing the use of shutter speeds approximately 4 stops slower. The lens also has a minimum focusing distance of 28cm (11-inch) throughout the entire zoom range and a maximum magnification ratio of 1:5. The Sigma 17-50mm F2.8 lens is currently available for $669 a pop. [dcviews]
