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The Leica Extender L 1.4x extends the focal length of your telephoto lens and makes it even more powerful and versatile. Designed exclusively for the 100-400mm f5-6.3 Vario-Elmar-SL lens, this extender increases the focal length range to 140-560mm. 7 elements in 4 groups ensure high visual quality across the focal length range and the extender is super compact and portable.