The Sigma 105mm f/2.8 Macro DG OS HSM is a Macro lens with FF and APS-C format from 2011. Good performance thanks to the ultrasonic AF motor and excellent image stabilization. the lens is compatible with fullframe lenses also from other manufacturers (Sony, Canon, Nikon). Equipped with a 105 mm focal length, it boasts sixteen elements divided into eleven groups. Stabilization is incorporated as well as internal AF and Full Time MF. The Sigma 105mm f/2.8 Macro DG OS HSM is a truly satisfactory lens, only in excessive lighting conditions does it tend to fail. An excellent system especially for those who are only equipped with lenses integrated with the camera, a medium impact lens that certainly stands out in the photographic field. The sharpness is incredible, perfect for anyone who wants to take portraits or play with focal length. The stabilizer is good but not excellent, especially considering the slight noise. Overall the Sigma 105mm f/2.8 Macro DG OS HSM turns out to do an excellent, if not exceptional, job. Compared to other products on the market it is certainly among the most efficient in its category. This Sigma lens is high-performance, light and comfortable even in daily use, an excellent investment. Ideal for: Photographers, even professionals, who want a lens with an edge in a medium-priced economic category. Perfect especially for those who want to photograph landscapes and moving subjects, excellent color rendering in both low light and good light conditions.