Zhongyi Mitakon Turbo II Focal Reducer Booster Adapter Nikon F AI Lens to Sony E NEX Camera Type: AI Mount to NEX Camera Up-to-date 4 elements 3 group lens, including 2 lanthanide lens, which can effectively reduce dispersion and improve the edge imaging. Newly improved coating help you get rid of the parasitic light caused by the mutual reflection between lens. Unique rectangle rear lens: better fit the CMOS and promote the imaging quality. Suitable for Nikon AI lens mount to Sony NEX cameras. NOT suitable for 35mm sensor NEX camcorders, may have some problems in APS-C NEX camcorders. Only minimum aperture can be used in AF-S (G) auto focusing lenses. NOT recommended for DX lenses. Avoid direct shooting to light source, or otherwise blue spot occurs. MUST set the camera to "Shooting without lens" mode to ON before use.