Sigma 2x EX DG APO Teleconverter 35mm Converters

Product Description

The Sigma 2x EX DG APO Tele Converter will multiply the focal length of the existing lens by 2x, and will cut back the amount of light by 2 f/stops. For example, using a 2x teleconverter with a 300 mm lens will effectively increase the focal length to 600mm. A lens set to f/2.8 will now be f/5.6.