The Sony LAEA4 A-Mount to E-Mount Lens Adapter enables you to attach virtually any A-mount lens to an Alpha E-mount full-frame digital camera body. The adapter features a built-in AF motor, aperture-drive mechanism and Translucent Mirror Technology to enable full-time, continuous, TTL phase-detection autofocus. AF is supported with all A-mount lenses except STF models, and auto exposure will be enabled with all compatible lenses.