Sony LA-EA4 A-Mount to E-Mount FF Lens Adapter with TMT Focus Points: 15-point AF system with 3 cross sensors. AF Modes: Continuous AF, Single-shot. 35 mm Full frame compatibility The LA-EA4 Adaptor allows you to attach Alpha A-mount lenses to your E-mount full frame or APS-C camera body and enjoy full-time continuous Phase Detection AF. Focus System: TTL phase detection system. Translucent Mirror Technology. Aperture drive mechanism enables Auto Exposure with compatible A-mount lenses.