A new adapter has been created for NEX owners in the form of the Metabones Speedbooster, which is now available to purchase for around $600. Metabones have created the new Speedbooster lens adapter specifically for NEX camera and adds an number of great features for serious NEX camera users.
Firstly the Metabones Speedbooster makes your lens wider by a factor of 0.71x, shrinking an 85mm lens to 59mm, and making your NEX camera nearly full-frame. Watch the video after the jump to see it in action.
As well as adapting your Canon EF full-frame lenses to E-Mount, and increasing the speed of a lens by a full stop. Even though this sounds hard to believe it is accomplished by concentrating the extra light-gathering area of a full-frame lens down to the smaller E-mount sensor area. Thus converting an f4.0 lens into an f2.8 lens, for example.
Source: Engadget