This f2.8 lens is one of a number of Sigma macro lenses and sits between the 105mm and 180mm units. It is image stabilised and focuses internally so the lens barrel does not extend. It has full frame coverage and on an APS sensor camera has a focal length equivalent of 225mm.

There aren't many third-party manufacturer products which truly stand out from the crowd. However, Sigma's 150mm f/2.8 EX DG HSM APO macro lens was clearly one of them. Sigma has just released its successor featuring Sigma's OS (Optical Image Stabilizer).