Metabones speedbooster: is there any reason to get full frame now?

I'll point out ignorance where I see it. Feel free to press "complain" or ignore user but don't blame me if you say something that suggests you don't understand what you are talking about or are perhaps attempting some rhetorical exaggeration. If I'm wrong (e.g. this is not a well-known optical technique), then try providing evidence rather than taking offense.

What's your point? Various third-parties have been making compatible lenses and optical converters for decades.

--
Erik