Tamron, announced the new Tamron 10-24mm f/3.5-4.5 Di II VC HLD for APS-C, it will be the replacement for the Tamron SP AF10-24mm F/3.5-4.5 Di II LD Aspherical [IF] which is on the market since 2008. The new model is based on the same idea as the old one; but it is equipped with the newest lens technology by Tamron, including VC (image stabilization) and new weather proof coating, and the new HLD-autofocus. The wide-angle-lens provides a range of 16-37mm on the APS-C camera (equivalent to full frame). The lens has 16 optical elements in 11 groups of these is one LD-element, and one XLD-element together with one aspherical-element and one hybrid-aspherical-element. The BBAR (Broad-Band Anti-Reflection) artificial aging will quash effectively reflexions and flare light inside the lens.
The lens will be available end of March for Canon and Nikon.
This could be a serious competitor for the Canon 10-22mm f/3.5-4.5 USM.