CanonWatch spotted that video showing a yet not announced Speed Booster adapter for the Canon EOS-M system! On Metabones website you can find NEX and X mount adapters only.
And by the way, Metabones isn't the only manufacturer offering a "Speed Booster" solution. The Chinese company Mitakon now sold their first "Lens Turbo" adapters on eBay (Click here - auction sold out).
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