There aren't too many lens adapters that catch our eye, but the $600 Metabones Speedbooster has so many tricks up its sleeve that we can see it tempting a lot of serious NEX camera users -- like us. Big words, but what it purports to do is nothing short of mind-boggling. First off, it adapts your Canon EF (full-frame) lenses to E-Mount, which is nice enough since there's still a paucity of high-end glass for NEX users. But it gets better: the Speedbooste
