The very first stock of NEX Speed Boosters is shipping on the Metabones site and on eBay. What about the MFT versions? Manual focus lenses such as Nikon, Leica R, Contax C/Y, Contarex, ALPA and Rollei will be supported in March, 2013. To get notified when the MFT version will be available you may also save this eBay search on Slidoo (you can change the search country in settings).
Metabones writes that the m4/3 version also reduces focal length by a 0.71x factor. So, the combined focal length multiplier of a m4/3 camera and Speed Booster is 1.4x. (2x from camera x 0.71x from Speed Booster.) The optics are optimized for the smaller sensor size.
That said there are plenty of new tests you have to read to learn more about the quality and features of the new adapter. Dpreview (Click here), EosHD (Click here) and Lensrentals (Click here) tested the Booster. And Robert from LR writes: “The Speed Booster does what they said it would do, much to my shock and surprise“. Overall from what I have seen now the adapters delivers what it promises. And personally I hope they will also make the OM Speed Booster. Suddenly my small collection of OM lenses will be faster…that’s so cool!
List of OM prime lenses. Click on the link to check the price and auctions on eBay: 21mm f/2.0 and 21mm f/3.5 lens, 24mm f/2.0 and 24mm f/2.8 and 24mm f/3.5 shift lens, 28mm f/2.0 and 28mm f/2.8 and 28mm f/3.5 lens, 35mm f/2.0 and 35mm f/2.8 and 35mm f/2.8 shift lens, 40mm f/2.0 lens, 50mm f/1.2 and 50mm f/1.4 and 50mm f/1.8 and 50mm f/2.0 macro and 50mm f/3.5 lens, 55mm f/3.5 macro lens, 85mm f/2.0 lens, 90mm f/2.0 macro lens, 100mm f/2.0 and 100mm f/2.8 lens, 135mm f/2.8 and 135mm f/3.5 lens, 180mm f/2.0 and 180mm f/2.8 lens, 200mm f/4.0 and 200mm f/5.0 lens, 250mm f/2.0 lens, 300mm f/4.5 lens, 350mm f/2.8 lens,, 400mm f/6.4 lens, 500mm f/8.0 lens, 600mm f/6.6 lens, 1000mm f/11 lens.