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Viltrox NF M43X Focal Reducer Speed Booster Lens Adapter Turbo Aperture for Nikon Lens to M4/3 Camera GH4 GH5 GH85 GF7 GX7|speed booster|focal reducerlens turbo - AliExpress
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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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Amazon.com : RJ Speed Booster for Nikon F/G Mount Lens to Micro 4/3 M4/3 GH2 GH3 GH4 BMPCC with rotatable Arca Fitting Tripod colloar : Camera & Photo
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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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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
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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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