Tamron SP AF 28-75mm f/2.8 XR Di LD Aspherical [IF] Lens
Although Tamron's SP AF 28-75mm f/2.8 XR Di LD Aspherical [IF] lens has been designed for cameras with 36 x 24mm sensors, it is also usable on cameras with smaller, APS-C sized sensors, where it covers a focal length range of 44.8-120mm on Canon DSLRs or 42-112.5mm on all the rest.
You want a fast standard zoom lens with excellent performance for use on ‘full frame' and ‘APS-C' DSLR cameras; You'd like a lens that requires no readjustment when you fit polarisers and graduated filters; You want attractive bokeh at wide apertures.