The 150mm f/2.8 is a high speed telephoto utilizing Mamiya's ultra-low dispersion glass for superior performance at all apertures. It is ideally matched for use with the 2X Tele-Extender for performance identical to the 300mm f/5.6 lens. In addition, many fashion and sports photographers find it to be an excellent companion to the Mamiya 300mm f/2.8 APO.