My review for MC-20, the 2x teleconverter from Olympus: Micro Four Thirds Talk Forum: Digital Photography Review
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Olympus M.Zuiko Digital 2x Teleconverter MC-20 review | Digital Camera World
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Olympus M.Zuiko Digital 2x Teleconverter MC-20 Doubles the Master Lens' Focal Length for Super Telephoto & Super Telephoto Macro Shooting: Portability, Dust/Splash/Freezeproof (-10°C), Compatible with M.Zuiko Digital ED 40-150mm F2.8 PRO, M.Zuiko
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Amazon.com : Olympus M.Zuiko Digital MC-20, 2X Teleconverter : Electronics
Olympus MC-20 M.Zuiko Digital 2x Teleconverter Lens New from JAPAN 50332192409 | eBay
ROBIN WONG : Olympus M.Zuiko MC-20 2X Teleconverter Lens - Hands On Impression
Amazon.com : Olympus M.Zuiko Digital MC-20, 2X Teleconverter : Electronics