Feature: 1. Suitable: The camera lens adapter ring adapter for EF EF S mount to for Sony E mount, suitable for Sony A7R3, A7M3, A7R4 and so on. 2. Support Aperture Adjustment: The adapter ring is equipped with electronic contacts and data chip, which can adjust the aperture effectively and quickly in the body. The function of the camera is maintained after the camera is transferred to the camera that supports the anti shaking function, which improves its shooting stability. 3. Support Eye Focus: The auto focus lens adapter ring supports real time tracking and video real time eye focus function, real time tracking of the shooting subject, improve the overall stability of shooting. 4. Upgraded USB Firmware: The built in upgraded USB firmware interface, after upgrade, it can be compatible with new models and new lenses to solve compatibility problems, has AF autofocus, dual focus mode, the PDAF phase focus or CDAF contrast focus, two modes, can be quickly switch. 5. EXIF Information Transmission: The automatic adapter ring can record the shooting information and data of photos, and support the body and picture software to view the aperture, shutter, ISO and other information. Specification: Item Type: Camera Lens Adapter Ring Material: Aluminum Alloy Weight: Approx. 248g/8.75oz Color: As Shown Compatible Lens: For EF, EF S Series Lens Compatible Camera: For Sony E Mount Camera Focus Mode: Auto Focus Firmware Upgraded: USB Upgraded Port Maximum Diameter: Approx. 71mm/2.80in Length: Approx. 31mm/1.22in Front Cover: Camera Cover Rear Cover: Lens Dust Proof Cover Suitable: for Sony A7R3, A7M3, A7R4 and Other Models. Package List: 1 x Camera Lens Adapter Ring1 x Camera Rear Cover 1 x Camera Front Cover1 x Wrench 1 x Use Manual