This is a Canon EF 2x teleconverter for EF lenses. It is primarily a teleconverter for L telephoto lenses of 200mm or longer (commonly known as "white lenses"). (Can also be used with EF135mmF2L USM, EF200mmF2.8L II USM) For more details → <a href="https://global.canon/ja/c-museum/product/ef267.html" target=new>https://global.canon/ja/c-museum/product/ef267.html</a> The focal length of the lens is doubled, allowing for shooting at a longer telephoto range. Used item with scratches. There appears to be no mold or scratches on the lens. There are no particular problems with the operation. Includes the main body and front and rear caps.