Selling to organize and declutter for moving! This is a SIGMA teleconverter (2x) for Nikon F mount. Please understand that there are visible scratches and dents on the exterior before purchasing! It's a SIGMA EX adapter. I used it with a SIGMA 70-200mm lens! It was working fine until recently, and I was taking pictures with it. If you're thinking, "I want to take pictures of subjects that are a little further away," why not give it a try? - Brand: SIGMA - Model: EX - Type: Adapter - Features: Mount Adapter Thank you for looking. *Please understand that this is a used item, and it may deteriorate slightly more than the condition shown in the photos before purchasing!