Now realized thanks to XR technology, Tamron brings you the 28-75mm f/2.8 XR Di LD Aspherical (IF) Autofocus Lens - Nikon Mount light and small fast zoom. Unlike typical fast zooms, it weighs only 510g (18oz.), with filter size of 67mm and overall length of 92mm (3.6"). The optical performance is outstanding with the employment of an optical system using two XR elements, three LD elements, and four aspherical elements. In addition, the lens features the “Di” (Digitally Integrated Design) optical system to meet the performance characteristics of digital SLR cameras as well as film cameras.