The original Speed Booster is cool but pricey. There may be a Mitakon clone soon?
Many 43rumors reader can’t wait to buy the Micro Four Thirds Speed Booster adapter for (preorders here at Metabones). They are coming in April for Nikon, Leica R, Contax C/Y, Contarex, ALPA and Rollei lenses. Those lenses cost something between $399 and $550. If that is too much for you than you may wait for the Mitakon “Speed Booster clone” that are rumored to be released in July. It will be a manual adpater only and priced almost at half of the manual Speed Booster adapters ($200-250 versus the $399 from the Metabones).
This wouldn’t be the first MFT product from Mitakon. They already made a Mitakon 35mm f/0.95 lens (you can find here on eBay).