Your APS-C DSLR might have come with a 3X zoom lens. In a great many cases, this is what we call a "kit zoom" lens, and it does a great job of delivering a lot of versatility while not adding a lot of overall cost to your camera purchase.
The thing that might not be immediately obvious is that they often trade light sensitivity, particularly as they're zoomed in, for those cost savings. So what if you had the great versatility of a kit zoom's focal length with a bit more reach, matched with a light-gathering f/2.8 aperture when zoomed out wide? Add in the ability to shoot small objects at very close distances and you'd have this pinnacle of versatility, the Sigma Photo Contemporary Series 17-70mm zoom lens. Optical stabilization and HSM autofocus technology ensure that more of your pictures will be crisp and clear, even if the shooting conditions are tricky.
Designed to give you everything from a panorama of a sun-dappled river winding through Big Sky country, to tight shot of a desert lizard sunning itself on a nearby rock, this lens is ready for most day-to-day opportunities, whether they're in daylight or low light.