>>3589612It's not that hard to understand. When you fit ff lens to crop body, it's focal range increases by it's crop factor. For m43 to ff it's 2x. So 50mm lens practically becomes 100mm lens. But when you put it through speedbooster that same lens instead becomes a 65mm lens.
For filmaking this is very beneficial, since fitting wide angle zooms via normal dumb adaptor, would turn those focal ranges into standard range.
