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
BMCC variant Speed Booster works on GH3 and GH4 to give 1.28x crop, near full frame - EOSHD.com - Filmmaking Gear and Camera Reviews
Panasonic's GH4 becomes a Super35 4K contender thanks to Metabones XL 0.64x Speedbooster - Newsshooter
Metabones Speed Booster for Micro Four Thirds - Review - EOSHD.com - Filmmaking Gear and Camera Reviews
METABONES SPEEDBOOSTER XL 0.64x - NIKON F&G LENS TO MFT MOUNT FOR GH4 BMCC BMPCC | #1792618635
New Canon EF to MFT Metabones Speed Booster Makes a Super 35 Camera Out of the GH4
Ultra or XL? How to Choose a Speed Booster for the Panasonic GH4 - Suggestion of Motion
New Metabones Speed Booster ULTRA 0.71x EF to Micro 4/3 With Autofocus For The GH4 | 4K Shooters
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
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
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