1、COMPATIBILITY: The adapter enables for MD mount lens to be perfectly compatible with for NEX mount series camera systems, including for a9, a7R3, a7R2, a7M2, a7M3 and other models. 2、PREMIUM MATERIALS AND CRAFTSMANSHIP: It is made of aluminum alloy with anodic oxidation process, which has exquisite workmanship and is sturdy and abrasion resistant. 3、ACCURATE HOLE POSITION: The adapter bayonet fits perfectly with the camera and lens, combining tightly to ensure solid installation and easy and smooth disassembly. 4、FUNCTION: Supports full manual control, including manual focus, manual exposure and aperture priority. Coated with matte paint to reduce light reflection. It is also capable of infinity focusing. 5、PROFESSIONAL ADAPTER DEVICE: The adapter is a professional adapter device with rich features to meet the needs of professional photographers and provide them with more creative possibilities.