The Tokina AT-X Pro is a fast medium zoom lens that is smaller and more lightweight than a 28-70 mm f/2.8 lens made from other manufacturers, delivering super sharp images for a wide range of purposes. This Tokina camera lens is one of Tokina's "Advanced Technology-Xtra" series which have superior mechanisms, lens coatings, optics, and the most advanced technology. The Tokina AT-X Pro incorporates an additional feature of a focusing clutch that improves the operation of both manual and autofocus operations. This Tokina camera lens also performs well in low light situations with a sensor that easily detects these situations and allows in additional light to create a crisp and clear image. A wider aperture is another feature of this 28-70 mm f/2.8 lens which makes for excellent contrast and sharp details in even the larger prints. The barrels of this Tokina AT-X Pro lens are made of aluminum which increases the weight of this lens to some extent but makes it more durable with a more professional look and feel.