Canon EF 200-400mm f-4L IS USM Extender 1.4X Zoom Lens (White): "EF 200-400mm f4L IS USM Extender 1. 4X This is a newly designed Canon 200-400mm telephoto lens that has a built-in 1. 4x extender, which can be activated just by flicking a switch to extend the focal length range to 280-560mm by just dropping a stop of lens brightness. There are three image stabilization modes offering four-stops of correction and a ring-type USM (Ultra-Sonic Motor) that keeps the lens quiet during focusing. The lens is ideally suitable for wildlife, sports and other journalistic photo ops. Designed to satisfy the discriminating needs of sports and wildlife photographers, the EF 200-400mm f4L IS USM Extender 1. 4X is a high-performance super telephoto zoom lens with an optically matched built-in 1. 4x extender for maximum versatility."'via Blog this'
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