This is a Sigma 2x Tele Converter with a Canon mount. Auto focus is still enabled with this Tele Converter. I purchased this converter in June of 2007 from B&H Photo. It's in pristine condition as I've only used it 3 times. I'm upgrading to all Canon gear so I won't need this converter. It is in perfect condition and very nice.Comes with a real nice zippered soft case, and instructions, in factory box. $175 Shipped to Continental U.S.