This 2x teleconverter attaches to any T-mount lens, and effectively doubles the focal length of that lens. for example using this teleconvertor with a 500mm F5.6 lens will give an effective focal length of 1000mm F11. This allowes the photographer to get much closer to the action. This simple, yet high-grade adapter provides excellent optical quality at an affordable price.
The Pro Optic 2x is most used by customers who consider themselves to be a Photo enthusiast among others.One reason why the Pro Optic 2x is popular is because of its Easily interchangeable.