2x teleconverter for Canon EF mount. Version 3. - Brand: Canon - Model: EXTENDER EF 2x III - Type: Teleconverter - Connection Type: EF Mount Thank you for looking. There are some scratches from use, but I think it can still be used without any problems. I can't see any mold or dust with the naked eye. I am selling it because I am changing mounts. The serial number has been recorded to prevent swapping.