One of the finest telephoto zoom lenses in the EF line, comparable to a single focal length lens. It has four UD-glass elements to correct chromatic aberrations. The newly designed multiple zoom groups for inner focusing bring high image quality throughout the entire zooming range. Compatible with Extender EF 1.4x & 2x. Lens construction: 18 elements in 15 groups Diagonal angle of view: 34°-12° Focus adjustment: Inner focusing system with USM Closest focusing distance: 1.5m / 4.9ft Zoom system: Rotating type Filter
Size: 77mm