Sigma EX APO DG 2.0x Teleconverter Lens for Nikon - Black

The Sigma 2.0X APO Extender DG is a dedicated teleconverter lens that multiplies the focal length of the existing lens by 2x. It cut backs the amount of light by 2 f/stops. This teleconverter lens has Multi-layer coating that helps to reduce ghosting and flares. With the 2.0 X APO extender DG you can increase can effectively increase the actual focal length of the lens to twice its length. For example, a 300 mm lens will now have a focal length of 600 mm with this teleconverter.