this sigma lens is very interesting and not so expensive compared to it's equivalent range but does comes close to the Tamron 17-50mm equivalent which makes them both great lenses to have around now in retail shop stores outlet near by
said to be the worlds first 15x zoom lens for Canon and Nikon dSLR camera and is stabilized that offers wide angle to telephoto zoom features real nice and handy to carry around when on a tour
with a fast f/2.8 throughout the range it delivers faster shutter speeds and a natural soft-focus effect that makes your photography even more sophisticated give your camera what it's been waiting for, and realize your creative potential