The Tamron B001 SP AF10-24mm F/3.5-4.5 Di II Ultra Wide Angle Lens is the ultimate extended-range, ultra wide angle zoom lens. It's wider and longer than other lens in the same class. The Tamron B001 lens is compact and lightweight, making it a great choice for those seeking a high-performance lens for DSLRs with APS-C size sensors. It provides the 35mm equivalent coverage of from 16mm ultra-wide to 37mm semi-wide, a remarkable 2.4X zoom ratio. With a maximum coverage of over 108 degrees, this lens is a state-of-the-art classic that is perfect for expanding your photographic horizons.