The Sony NEX system uses the same APS-C size sensor found in its mainstream Alpha D-SLR cameras. Because of this, it's possible to adapt Sony and Minolta Alpha mount lenses to the NEX system. The LA-EA2 Alpha NEX Camera Mount Adapter ($399.99 direct) not only adapts the lenses, but it adds a dedicated phase detection autofocus system to your NEX camera for extremely fast focus when shooting stills and video. A translucent mirror allows most light to pass through to the NEX image sensor, but a small quantity is redirected to the autofocus sensor in order to deliver speedy autofocus.

The adapter is compatible with all NEX cameras, although older models will require a firmware update. Its autofocus system uses 15 points with three cross sensors. Front and rear caps and a pouch are included to protect the adapter when it is stored in your camera bag. The adapter measures 3.5 by 3.1 by 1.8 inches (HWD) and weighs 7.1 ounces.

If you don't require the advanced autofocus system, you can also use the less-expensive LA-EA1 ($199.99 direct) to mount Alpha lenses on your NEX. That model is also a bit lighter, but its contrast detection autofocus system is rather slow.