Lightweight and compact long-range tele zooms are a boon for sports, action, and wildlife photographers. The Sony 100-400mm weighs only 1395g and is 205mm long, making it ideal for fieldwork in both the outdoors and in sports and event venues. The demands of these subjects requires fast and responsive AF, aided in this lens by a double linear motor and an ultrasonic driver, which Sony dubs Direct Drive SSM, and a zoom “torque adjustment,” that provides fine adjustment for both fast and slow zoom rates. Built-in optical stabilization helps capture blur-free images, with 5-axis stabilization available when used with a-series bodies that feature in-body stabilization.