Panasonic's GH4 becomes a Super35 4K contender thanks to Metabones XL 0.64x Speedbooster - Newsshooter
Viltrox Canon EF Lens to M43 MTF Mount Camera 0.71x Speed Booster adattatore obiettivo riduttore focale messa a fuoco automatica per GH4 GH5 GF6 BMCC - AliExpress
Metabones creates Speed Booster ULTRA with improved optics and Canon lens AF for Panasonic users: Digital Photography Review
Metabones®
Viltrox Canon EF Lens to M43 MTF Mount Camera 0.71x Speed Booster adattatore obiettivo riduttore focale messa a fuoco automatica per GH4 GH5 GF6 BMCC - AliExpress
Panasonic G7 and Metabones Speed Booster XL hands-on - Super 35mm 4K for cheaper - EOSHD.com - Filmmaking Gear and Camera Reviews
Reader Q&A: Do I Really Need a Speed Booster for the Panasonic GH4?
Panasonic G7 and Metabones Speed Booster XL hands-on - Super 35mm 4K for cheaper - EOSHD.com - Filmmaking Gear and Camera Reviews
Why You Need a Speed Booster For Your Lumix G7 - YouTube