Zoom from 70 mm medium telephoto to 200 mm telephoto with a constant F2.8 maximum aperture. Original Sony Nano AR Coating technology suppresses internal reflections, minimising flare and ghosting for outstanding clarity from highlights to well-defined blacks. Four ED glass elements contribute to prime-lens class sharpness throughout the zoom range, but this lens can also produce gorgeous background bokeh when needed. Subject tracking is approximately 4x faster than the preceding model, so even fast moving subjects are kept in sharp focus. A dust- and moisture-resistant design contributes to consistently reliable performance when shooting sports, wildlife or other subjects outdoors.