Sony FE 16-35mm f/2.8 GM II Lens (Sony E) Key Features Key Features Full-Frame f/2.8 to f/22 Fast Wide-Angle Zoom 20% Lighter, 10% Smaller than Previous Four XD Linear AF Motors, Floating Focus Aperture De-Click and Lock Switches Zoom Smoothness Switch XA and Super ED Elements Fluorine Coating Dust and Moisture-Resistant Construction Wide-Angle Versatility for Stills & Video Combining G Master performance with the lightest and smallest form factor in its class, Sony rounds out its trinity of f/2.8 G Master zoom lenses with its latest wide-angle offering for video and stills shooters, the FE 16-35mm f/2.8 GM II Lens, which boasts a variety of optical, focusing, and handling upgrades. G Master Image Quality Designed to rival the primes, this zoom's optics have been revamped to provide even greater resolution, clarity, and bokeh quality. Bright f/2.8 constant aperture allows users to capture images in dim lighting conditions and with a shallow depth of field. One Super ED (extra-low dispersion) and Two ED elements effectively suppress chromatic aberrations and color fringing for greater clarity and color fidelity. Five aspherical elements, including three extreme aspherical elements (XA), minimize spherical aberrations, distortion, and also reduce 'onion ring' bokeh. Faster AF and Floating Focus Mechanism Faster focusing performance, improved close-up shooting, and enhanced control are all benefits of the redesigned focusing system. Four XD (extreme dynamic) linear motors contribute to greatly improved focusing performance, compared to the DDSSM system of the predecessor, including faster, quieter, and more precise AF that's ideal for both video and stills. Faster AF means improved focusing when working with fast-moving subjects; support is available for shooting at up to 30 fps, full AF is maintained even when shooting stopped down, and focus tracking is possible even when changing the zoom position