Sigma Macro 150mm f/2.8 EX DG OS HSM APO is an extremely sharp lens with minimal distortion and 1:1 magnification reproduction. This lens is a high-performance macro lens chassis for full frame cameras; however, it is compatible with cameras with smaller APS-C size senors. The superior designed lens employs Sigma's Optical Stablizer (OS), Hyper Sonic Motor (HSM) and Super Multi-Layer Coating. The designated OS prevents blurred images caused by camera shake and the HSM promises precise, fast and silent high speed AF system. The optical technology corrects aberrations and the Super Multi-layer Coating reduces flare and ghosting. The lens concerts 19 elements in 13 groups with three SLD glass elements, nine diaphragm blades, 16.4° viewing angle, 0.38 meters close focusing distance and 72mm filter thread.