The Sigma 17-50mm F2.8 EX DC OS HSM
The Sigma 17-50mm F2.8 EX DC OS HSM lens is a world-class lens for photographers who want the utmost in image quality in a fast, constant-aperture standard zoom designed specifically for APS-C DSLRs.
For wedding ,news and studio pros, and the most discerning enthusiasts, this is the ultimate upgrade from the slow, variable aperture standard kit lens.
The wide F2.8 remains constant throughout the entire zoom range, making this lens perfect for available light portraits and candids and that fast F2.8 aperture at all focal length also offers maximum flash range, when you choose to add light. And with Sigma’s Optical Stabilizer System built in, you can make great sharp images in very low light at slower shutter speeds – without a tripod.