Metabones has announced the schedule for the Micro Four Thirds version of its innovative 'Speed Booster' lens adapter has slipped to the second half of 2013. Like the existing version for mounting Canon EF lenses on Sony NEX cameras, the forthcoming version will allow the use of full-frame lenses, reducing the focal length by a factor of 0.71x and increases the maximum aperture by 1 stop. The Micro Four Thirds version will give a 1.4x overall 'crop' - giving a similar field of view to APS-C stills cameras and the Super35mm video format.

The Speed Booster is available in an increasing number of other lens/mount combinations. Its first incarnation was a Canon EF to Sony NEX apapter, which we tested by mounting a few Canon lenses on a Sony NEX-6. Click here to read some of our initial thoughts on the possibilities and challenges presented by such a unique product.

Notice on the Metabones website

'We apologize but the m4/3 schedule is slipping. Manual focus lenses such as Nikon, Leica R, Contax C/Y, Contarex, ALPA and Rollei will be supported in the second half of 2013. Canon EF lens (but not EF-S) support is planned in the future, but we do not have an estimated date yet.(via 43rumors)

The 'Speed Booster' lens adapter allows users to mount SLR lenses on APS-C and Micro Four Thirds mirrorless cameras that reduces the focal length by a factor of 0.71x and increases the maximum aperture by 1 stop.