Sony 100mm f/2.8 Macro Lens for Sony Alpha Digital SLR Camera 100mm macro lens with f/2.8 maximum aperture for Sony Alpha digital SLR cameras Works with Super SteadyShot image stabilization system to keep image steady in low light Focus range limiter speeds up autofocus response; focus hold button gives you full control High contrast and resolution gives your shots greater visual accuracy for close analysis Measures 3 inches in diameter and 4 inches long; weighs 1 pound, 2 ounces