Olympus 300mm f4 Review: Full-frame 600mm f4 results?

Tony reviews the Olympus 300mm f4 (http://sdp.io/o300) and compares it against competition from other systems: the Nikon 600mm f4 (http://sdp.io/n600f4), the Nikon 200-500 (http://sdp.io/n200500) and the Sony 200-600 (http://sdp.io/s200600).

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