VILTROX EF-E2II (Second Generation) Speed Booster 0.71x Hardly used. Accessories include: [Tripod mount] Screw-on, removable by hand. - Front and rear caps - Instruction manual - Original box * Everything shown in the photos will be sent. This is an adapter for attaching Canon EF lenses to Sony E-mount cameras. It's a reducer lens, allowing you to use full-frame lenses with an APS-C sensor at a focal length similar to the original lens. The aperture also becomes one stop brighter, so a F2.8 lens can be used at F2. Full-frame cameras can be cropped to APS-C and used at the same focal length with the aperture one stop brighter as well. Operation has been confirmed. Operation was confirmed on full-frame α7 series cameras. It worked with single contrast AF on older Nex series cameras, and with Fast Hybrid AF on α7RII and later models. There is a switch on the VILTROX body for switching. Depending on the lens, infinity focus may not be achievable. In such cases, it seems you can adjust by rotating the lens within the adapter. Also, when attaching the lens, if the lens aperture is not displayed on the camera, it means it is not recognized, so please refer to the instruction manual. In my case, removing and reattaching the lens usually worked. The price will return to 17,000 yen after May 31st.