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Canon 5176B002 EF 200-400mm f/4L IS USM Extender 1.4X Lens - International Version Camera Lenses - Newegg.com
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Amazon.com : Canon EF 200-400mm f/4L is USM Extender 1.4X Lens (5176B002) + Cap Keeper + Cleaning Kit + More (Renewed) : Electronics
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Canon EF 200-400mm f/4L IS USM Extender 1.4X review: Canon's supertele marries flexibility with quality - CNET
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