How Does a Speedbooster Work ? ( and Metabones vs Viltrox )

Tried to explain as best as I could how a speed booster works relative to crop factor if you're interested. Plus an unsponsored real life comparison between the Viltrox EF-M2 and Metabones Ultra 0.71x speedboosters. Note that this is the MkI version of the Viltrox EF-M2, the viltrox EF-M2 II is better. Please correct me if some things are unclear or if I'm wrong :) Hope you like it ! Download link for the DNG stills : https://zebrazone.tv/bfd_download/Zeb... Many thanks to my friends Claire and Mathieu for their time and help for this video to whom goes the credit for the performance in the comparison shots. The video was shot with an URSA Mini Pro and a Sigma 18-35mm ART lens, the comparison footage was shot with the same lens and a Blackmagic Pocket 4K Camera (BMPCC 4K). But you can also use a speed booster with the GH5 , GH5S or other micro four thirds based cameras. Follow Zebra Zone on Instagram !   / zebrazone.mov   Check out the Zebra Zone blog for more content : https://zebrazone.tv