Before you go on in full glee, know that the Laowa Venus Optics Magic Format Converter isn’t exactly what you think it is. Yes, it’s a converter for the Fujifilm GFX camera system and therefore one of the mounts on the converter is G format. However, it doesn’t work in the same way that a speedbooster does. To help you fully understand this, let us explain.
A speedbooster takes a lens from a larger format, puts it onto a smaller format, and both widens the lens and makes its aperture faster. So a 35mm f1.4 Sigma Art with a speedbooster attached to a Sony a6500 will become a 24mm f1.2 basically. That’s how the system and the idea work. Though that’s not the case with the Laowa Venus Optics Magic Format Converter.