Thank you very much for viewing. This is a SIGMA APO TELE CONVERTER 1.4 x EX DG teleconverter for Canon. I received it from an acquaintance, and I am selling it because I have no opportunity to use it. I have no knowledge of photography, so please understand that I cannot provide detailed explanations. It is unconfirmed, so it is sold as a junk item. Please note that this is a used item and has some scratches from use. Please check the photos carefully and consider purchasing. It will be delivered as is.