About the product                  

                    The technical details behind this teleconverter                    
Sigma TC-2001 2.0X Tele Converter - Canon is suitable for professional use since its durable construction is splash and dust-proof. It is also compact and light and delivers easy extension of focal range. This teleconverter from Sigma is developed for the new lens lines. By mounting it in between a telephoto lens and a camera, the delivered magnification of the focal length of TC-2001 is 2.0 times. Both models incorporate Special Low Dispersion (SLD) glass elements that provide superb aberration correction.                    
Key features                    
Shooting Range & Shooting Ratio: 2 times of magnification from original lens                    
Lens Construction: 10 Elements in 5 Groups                    
For Canon EF Mount                    
Top three Reasons we think you will love this teleconverter                    
Compact and Light                    
Better Image Quality                    
Durable