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Turn your Zuiko Digital 300mm f2.8 into a 420mm f4.0 (35mm equivalent 840mm f4.0). The EC14 is compatible with the Zuiko Digital 14-54mm f2.8/3.5, 50-200mm f2.8/3.5, 300mm f2.8, and 50mm f2.0 (f2.8 and up) lenses
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