Sony  LA-EA4 α System A-Mount  Adapter Lens 
Lens Adapter for Sony Full Frame Mirrorless Camera

OVERVIEW
Attach Alpha A-mount lenses to your E-mount full frame camera body and enjoy full-time continuous Phase Detection AF
while capturing stills and video with world's first full frame mount adaptor to be equipped with Translucent Mirror Technology.
Plus， aperture drive mechanism enables Auto Exposure with compatible A-mount lenses.

SPECIFICATION                                                                                                                                                                                                                                                      AFSystem 15-point TTL phase detection system with 3 cross sensors
AF Modes Continuous AF， single-shot
Dimensions Approx. 3.1 x 3.4 x 1.7" (7.9 x 8.7 x 4.4 cm)
Weight Approx. 5.6 oz (160 g)