The RF600mm F11 IS STM super-telephoto lens provides a long 600 millimeter focal length and is the first compact and lightweight 600mm super telephoto lens in the RF lineup. This lens is ideal forbird, wildlife, outdoor sports, and aviation. The size of this lens, and it's retracting design, make it a highly portable option which can be stored easily in a camera bagand the built-in optical image stabilization with up to 5 stops of shake correction* makes it easy to use either hand-held or with a monopod. The RF600mm F11 IS STM lens will also accept an RF 1.4X or 2.0X teleconverter^ to increase your focal length to 840mm or 1200mm respectively.