For $600 the Metabones Speedbooster lens adapter will...

wheelema

wheelema

Boner-obo
Let you mount an EF lens to a NEX body which...

...makes your lens wider by a factor of 0.71x, shrinking an 85mm lens to 59mm, for instance -- effectively making your NEX nearly full-frame. Other adapters can do some of that, but its final trick is the piece de resistance: increasing the speed of a lens by a full stop. That may sound impossible, but it apparently works by concentrating the extra light-gathering area of a full-frame lens down to the smaller E-mount sensor area, turning an f4.0 lens into an f2.8 lens,
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Metabones Speedbooster promises faster EF lenses when mounted on NEX cameras

Want a 24 megapixel full frame camera with a 9.94mm f/1.2 lens for $3,700? It's a brave new world.
 
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