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Just posted: Canon EF 200-400mm f/4L IS USM Extender 1.4x review

June 25, 2013 by  

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Just posted: Our quick review of the Canon EF 200-400mm f/4L IS USM Extender 1.4x: the world's first SLR zoom with a built-in switchable teleconverter. It's been two years in the making, but when Canon offered to show us a production version of its professional super-telezoom, we couldn't help but be intrigued. In this review we've teamed up with DxOMark to bring you full optical test data of this unique lens, backed up by some quick real-world examples. So how does it perform? Click through to find out. 

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