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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Metabones Releases New Lens Adapter for Panasonic GH4, Adds Autofocus via Firmware Update for Existing Models | Fstoppers
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Panasonic's GH4 becomes a Super35 4K contender thanks to Metabones XL 0.64x Speedbooster - Newsshooter
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