The all new Canon EF-S 17-55mm f/2.8 IS USM Standard Zoom Lens provides image quality on a par with Canons highly regarded L-series lenses. It has a large maximum aperture which, combined with higher shutter speeds, can minimize subject motion blur. Further more the shallow depth-of-field separation of a subject from its background is simpler to achieve. Finally the f2.8 maximum aperture allows a bright finder and extremely precise focusing with f2.8 compatible AF sensors.

All in all, this is one hell of a lens, and will get the picture you want.