Sony 70-300mm f4.5-5.6 G SSM Lens. A very high quality G Series telephoto zoom lens with wide focal length range. Smooth, silent AF operation using high-torque SSM (Super Sonic wave Motor). G Series optics with Extra-low Dispersion (ED) glass elements for clear, sharp edge-to-edge description and reduced chromatic aberration. Circular aperture for beautiful defocus effects. Convenient operation with focus hold button and focus range limiter.