Canon EF 2X II Extender Telephoto Accessory Measures 2.8 inches in diameter and 2.3 inches long; weighs 9.3 ounces Maintains autofocus with any EOD body with f/2.8 or faster aperture Ideal for shooting close-ups from a distance at sporting events Telephoto extender designed to double Canon EF lens focal length Weather-resistant and anti-reflective internal construction Telephoto extender designed to double Canon EF lens focal length Ideal for shooting close-ups from a distance at sporting events Weather-resistant and anti-reflective internal construction Maintains autofocus with any EOD body with f/2.8 or faster aperture Measures 2.8 inches in diameter and 2.3 inches long; weighs 9.3 ounces