This Extender L 1.4x from Leica is a teleconverter designed for the Vario-Elmar-SL100-400mm f/5-6.3 zoom lens. It increases the lens' magnification by 1.4 times for a total zoom range of 140-560mm. The teleconverter is fortified against environmental conditions with its weather-sealed design and AquaDura coating.
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Now... in a way I do not have anything to write about that extender... And that is because you hardly know that it is there doing what it is supposed to do effortlessly without giving you even the slightest worry. It is there and yet it completely disappears which for an item like this I guess that is what you are looking for. So... go ahead, buy it and forget it...
I'm using this extender with the Leica 100-400 zoom with great results. Really excellent sharpness and tonal quality, considerably better than I expected. I mean, this combo is sharp!