A 500mm f/4 optical formula with one SLD and two FLD elements, plus Super Multi-Layer coating, delivers sharp, contrast-rich images, aided by a 4-stop Optical Stabilizer for handholding in dim conditions. Its dust- and splash-proof magnesium-alloy barrel, brass mount, and teleconverter compatibility ensure durability and extended reach options. This lens is ideal for sports and wildlife photographers who rely on fast Hyper Sonic AF with full-time manual override and a bright f/4 aperture to track distant, fast-moving subjects.