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Yes, Your Metabones Speedbooster/Smart Adapter Now Supports Autofocus on Panasonic Cameras - Resource
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Officially announced - Metabones Canon EF Speed Booster for Micro Four Thirds and Panasonic GH4 - EOSHD.com - Filmmaking Gear and Camera Reviews
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Panasonic's GH4 becomes a Super35 4K contender thanks to Metabones XL 0.64x Speedbooster - Newsshooter
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