Reviews and Problems with Canon 200-400mm f/4 IS USM Extender 1.4x
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15 September 2013
Summary: The Canon EF 200-400mm f/4L IS USM Extender 1.4x costs a small fortune, but look at all you get for 12 grand. Find out how we rate it in our Canon EF 200-400mm f/4L IS review. What can you expect from a lens that costs about the same as a brand-new small family car?