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Panasonic's GH4 becomes a Super35 4K contender thanks to Metabones XL 0.64x Speedbooster - Newsshooter
Officially announced - Metabones Canon EF Speed Booster for Micro Four Thirds and Panasonic GH4 - EOSHD.com - Filmmaking Gear and Camera Reviews
Lens Options for the Panasonic GH4: Adapted Lenses
Viltrox NF M43X Manual Focus 0.71x Reducer Speed Booster Lens Mount Adapter for Nikon G D Lens to M4/3 Camera GH5 GH4 GX85 E M10|speed booster|focal reducerring for nikon - AliExpress
METABONES SPEEDBOOSTER XL 0.64x - NIKON F&G LENS TO MFT MOUNT FOR GH4 BMCC BMPCC | #1792618635
Officially announced - Metabones Canon EF Speed Booster for Micro Four Thirds and Panasonic GH4 - EOSHD.com - Filmmaking Gear and Camera Reviews
Amazon.com : Metabones Nikon G to Micro Four Thirds Speed Booster XL 0.64x : Electronics
Hands on with the new Metabones Speed Booster Ultra - fast AF with Canon lenses on Micro Four Thirds - EOSHD.com - Filmmaking Gear and Camera Reviews
Speed Booster Showdown: Canon EF vs Nikon - Suggestion of Motion
Officially announced - Metabones Canon EF Speed Booster for Micro Four Thirds and Panasonic GH4 - EOSHD.com - Filmmaking Gear and Camera Reviews
New Canon EF to MFT Metabones Speed Booster Makes a Super 35 Camera Out of the GH4
Zhongyi Lens Turbo II Focal Reducer Speed Booster Adapter for Minolta MD Mount Lens to Micro 4/3 Camera MFT M4/3 GH4 OM D GX7|Lens Adapter| - AliExpress