The RF 100-500mm F4.5-7.1L IS USM is the top model among the RF telephoto zoom lenses of the L series and is ideal for demanding tasks that require a reliable, robust and compact lens for sports, wildlife and aerial photography, for example. If you want to go beyond the focal length range of 100-500mm, the RF 100-500mm F4.5-7.1L IS USM with the new Extender RF 1.4x and Extender RF 2x is the perfect combination. Extender RF 1.4x II and EF 2x II compatible.